G.f.: (1+x)/(1-3*x-2*x^2).
1, 4, 14, 50, 178, 634, 2258, 8042, 28642, 102010, 363314, 1293962, 4608514
2 seqfan posts
Thu Jul 22 21:20:48 CEST 2010 [seqfan] Re: A055099
Thu Jul 22 12:30:57 CEST 2010 [seqfan] A055099
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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