Number of n X n binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

A266356

Number of n X n binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

Terms

    a(0) =2a(1) =7a(2) =35a(3) =276a(4) =3669a(5) =93085a(6) =5061414a(7) =654427939

External references