Number of n X n binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.
A266929
Number of n X n binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.
Terms
- a(0) =2a(1) =4a(2) =9a(3) =35a(4) =210a(5) =2577a(6) =68890a(7) =4605960a(8) =821453747
External references
- oeis: A266929