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 90 degree rotation.
A187526
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 90 degree rotation.
Terms
- a(0) =50a(1) =8a(2) =3790a(3) =1476a(4) =3607148a(5) =296232
External references
- oeis: A187526