Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
A187696
Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
Terms
- a(0) =6a(1) =0a(2) =104a(3) =0a(4) =9350a(5) =0a(6) =4280018a(7) =0a(8) =9966761956a(9) =0a(11) =0a(13) =0a(15) =0
External references
- oeis: A187696