Number of (n+1)X(n+1) 0..2 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.
A187459
Number of (n+1)X(n+1) 0..2 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.
Terms
- a(0) =50a(1) =1236a(2) =89618a(3) =11684688a(4) =6112320620
External references
- oeis: A187459