Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.

A252554

Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.

Terms

    a(0) =2443a(1) =3178a(2) =8329a(3) =24336a(4) =80820a(5) =242136a(6) =748814a(7) =2418811a(8) =7241365a(9) =22589612a(10) =72639968a(11) =217514078a(12) =679385411a(13) =2183688694a(14) =6538414996a(15) =20427497702a(16) =65660270533a(17) =196569208093a(18) =614209968459

External references