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Neil<BR> Sorry. A107332 : (-1)Sigma exists already on
OEIS.<BR></FONT></DIV>
<DIV><FONT face="MS UI Gothic" size=2> I should have searched
it. <BR> Surely I had not submitted it, but you submitted it
as
A049060
. <BR> <BR>
Yasutoshi</FONT></DIV></BODY></HTML>