Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 antidiagonally.
A190340
Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 antidiagonally.
Terms
- a(0) =4a(1) =12a(2) =72a(3) =720a(4) =10800a(5) =259200a(6) =10368000a(7) =673920000a(8) =70087680000
External references
- oeis: A190340