Number of n X n nonnegative integer arrays with each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to n-1.

A202729

Number of n X n nonnegative integer arrays with each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it) and the lower right element equal to n-1.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =12a(4) =304a(5) =44976a(6) =51871384a(7) =600608922384

External references