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

A266463

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

Terms

    a(0) =2a(1) =4a(2) =12a(3) =66a(4) =735a(5) =18808a(6) =1231170a(7) =223521350a(8) =119000455681

External references