**The number of integer sequences of length d = 2n+1 such that the sum of the terms is 0 and the sum of the absolute values of the terms is d-1.**

*1, 6, 110, 2562, 66222, 1815506, 51697802, 1511679210, 45076309166*

*1 seqfan posts*

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

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