Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.

A187634

Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.

Terms

    a(0) =24a(1) =1648a(2) =14044a(3) =106892a(4) =306320a(5) =1848504a(6) =3549080a(7) =9810932a(8) =19774644a(9) =44235868a(10) =65964188a(11) =188874084a(12) =261388436a(13) =423186604a(14) =755637740a(15) =1198594384a(16) =1533264084a(17) =2755012728a(18) =3428332204a(19) =5907685880a(20) =8225807516

External references