Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

A252052

Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

Terms

    a(0) =10084a(1) =14924a(2) =26840a(3) =45444a(4) =191804a(5) =398502a(6) =658902a(7) =2988638a(8) =6379018a(9) =11153632a(10) =52020290a(11) =111908868a(12) =199878996a(13) =963130024a(14) =2076327370a(15) =3762297344a(16) =18635844314a(17) =40074236458a(18) =72960957866a(19) =370050794622a(20) =791436034456

External references