**G.f.: x^3/(1-2x+x^3-2x^4) = x^3/( (1-2x)(1+x)(1-x+x^2) ).**

*0, 0, 0, 1, 2, 4, 7, 14, 28, 57, 114, 228, 455, 910, 1820, 3641, 7282, 14564, 29127*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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