**Number of skew-symmetric n X n matrices A = (a_ij) with entries from {-1,0,+1} such that a_wx a_yz + a_wy a_zx + a_wz a_xy = a_wx a_wy a_wz a_xy a_xz a_yz for all distinct w,x,y,z in {1..n}.**

*1, 3, 27, 293, 3605, 52327, 899311, 1801901*

*4 seqfan posts*

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

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