**Number of n X n permutation matrices in which the sums of the entries of each NorthEast-SouthWest diagonal are 0 or 1.**

*1, 1, 3, 7, 23, 83, 405, 2113, 12657, 82297, 596483, 4698655, 40071743, 367854835*

*4 seqfan posts*

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

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