**G.f. A(x) satisfies the condition that both A(x) and F(x) = A(x*F(x)) = o.g.f. of A157310 have zeros for every other coefficient after initial terms; g.f. of dual sequence A157308 satisfies the same condition.**

*1, 1, 0, 1, 0, 9, 0, 176, 0, 5693, 0, 272185, 0, 18043492, 0, 1587355800, 0*

*2 seqfan posts*

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

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