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<DIV><FONT face=Arial size=2>Seqfans,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Below is my submission of a new
sequence:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Number of compositions of 2n in which each part has
even multiplicity.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is there an "elegant" formula/GF for this
seq.?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>V.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>%I A000001<BR>%S A000001
1,2,8,24,72,264,952,3352,11960,43656,160840,594568,2215480,8300056,31191480,117674504,445439944,1691011464,6437425720,24564925848,93937631544,359943235080<BR>%N
A000001 Number of compositions of 2n in which each part has even
multiplicity.<BR>%e A000001 Table of n, a(n) for n = 1..50<BR><BR>1 1<BR>2
2<BR>3 8<BR>4 24<BR>5 72<BR>6 264<BR>7 952<BR>8 3352<BR>9 11960<BR>10
43656<BR>11 160840<BR>12 594568<BR>13 2215480<BR>14 8300056<BR>15 31191480<BR>16
117674504<BR>17 445439944<BR>18 1691011464<BR>19 6437425720<BR>20
24564925848<BR>21 93937631544<BR>22 359943235080<BR>23 1381706541512<BR>24
5312678458888<BR>25 20458827990456<BR>26 78898261863832<BR>27
304666752525368<BR>28 1177917296854152<BR>29 4559335129446984<BR>30
17666556675108360<BR>31 68523021533870264<BR>32 266028985353139480<BR>33
1033724645977633464<BR>34 4020146511369758088<BR>35 15646589432891059528<BR>36
60942410793471545736<BR>37 237533290605090589752<BR>38
926442358309657850904<BR>39 3615653152390623771320<BR>40
14119392491623156786440<BR>41 55168805915171545165000<BR>42
215678977387306093805960<BR>43 843621907465521599000120<BR>44
3301441176541292976425112<BR>45 12926040490322737955361336<BR>46
50631974207069619560250632<BR>47 198414469648363719485005768<BR>48
777863140397512864870792200<BR>49 3050753611395618694067041976<BR>50
11969563573001226379198699672<BR>%O A000001 1<BR>%K A000001 ,nonn,<BR>%A A000001
Vladeta Jovovic (<A href="">vladeta@Eunet.yu</A>), Aug 08
2007<BR></DIV></BODY></HTML>