Number of n X n binary matrices with floor(n^2/2) 1's and rows in lexicographically nondecreasing order and columns in strictly increasing order.

A180982

Number of n X n binary matrices with floor(n^2/2) 1's and rows in lexicographically nondecreasing order and columns in strictly increasing order.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =71a(4) =2403a(5) =238535a(6) =73506103a(7) =64732546521

External references