Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
A187625
Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
Terms
- a(0) =24a(1) =446a(2) =2924a(3) =12104a(4) =37448a(5) =98014a(6) =221640a(7) =457632a(8) =871712a(9) =1562702a(10) =2649632a(11) =4329136a(12) =6782660a(13) =10323450a(14) =15291860a(15) =22111560a(16) =31246860a(17) =43422938a(18) =59215112a(19) =79658992a(20) =105617736a(21) =138251814a(22) =178796912a(23) =229108212a(24) =290437464a(25) =364933542
External references
- oeis: A187625