Expansion of (-1-4*x+x^2)/((1-x)*(x+1)*(x^2+2*x-1)); a Pellian-related sequence.
1, 6, 13, 36, 85, 210, 505, 1224, 2953, 7134, 17221, 41580, 100381, 242346, 585073
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Thu Nov 19 17:19:12 CET 2009 [seqfan] detective work related to Creighton Dement's "Floretions"