Number of n X n triangular (0,1)-matrices with exactly 2n entries equal to 1 and no zero rows or columns.
A357140
Number of n X n triangular (0,1)-matrices with exactly 2n entries equal to 1 and no zero rows or columns.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =26a(5) =865a(6) =39268a(7) =2375965a(8) =185974145a(9) =18337523130
External references
- oeis: A357140