Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
A187697
Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
Terms
- a(0) =50a(1) =8a(2) =7954a(3) =1548a(4) =15128848a(5) =454640a(6) =231192094416
External references
- oeis: A187697