a(n) = 2n*a(n-1) - (n-1)^2*a(n-2).
0, 1, 4, 20, 124, 920, 7940, 78040, 859580, 10477880, 139931620, 2030707640
8 seqfan posts
Thu Jul 8 19:10:13 CEST 2010 [seqfan] More on A002973 from Karol A. Penson
Tue Jul 6 04:33:06 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson
Tue Jul 6 00:01:43 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson/2
Mon Jul 5 22:43:08 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson
Mon Jul 5 21:16:45 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson
Mon Jul 5 19:33:26 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson
Mon Jul 5 19:11:16 CEST 2010 [seqfan] Re: Help with A002793 needed/Karol A. Penson
Mon Jul 5 19:02:09 CEST 2010 [seqfan] Help with A002793 needed/Karol A. Penson
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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