Number of n X n 0..1 matrices with row and column i=1..n having sum <= i.
A213955
Number of n X n 0..1 matrices with row and column i=1..n having sum <= i.
Terms
- a(0) =2a(1) =10a(2) =138a(3) =5314a(4) =575122a(5) =176041978a(6) =153143689594
External references
- oeis: A213955