Expansion of (1+4*x+x^2)/((x-1)*(x+1)*(x^2+2*x-1)); a Pellian-related sequence.
1, 6, 15, 40, 97, 238, 575, 1392, 3361, 8118, 19599, 47320, 114241, 275806, 665855
1 seqfan posts
Thu Nov 19 17:19:12 CET 2009 [seqfan] detective work related to Creighton Dement's "Floretions"