T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.

A187528

T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation.

Terms

    a(0) =6a(1) =50a(2) =0a(3) =192a(4) =8a(5) =104a(6) =512a(7) =74a(8) =3790a(9) =0a(10) =1126a(11) =280a(12) =35026a(13) =1476a(14) =9346a(15) =2146a(16) =784a(17) =220802a(18) =20554a(19) =3607148a(20) =0a(21) =3760a(22) =1970a(23) =727842a(24) =273102a(25) =164460556a(26) =296232a(27) =4278774a(28) =6112a(29) =3580

External references