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

A252437

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

Terms

    a(0) =878a(1) =1801a(2) =3954a(3) =7575a(4) =26396a(5) =74892a(6) =151863a(7) =530739a(8) =1491580a(9) =3021857a(10) =10585353a(11) =29761784a(12) =60370995a(13) =211427247a(14) =593997328a(15) =1205792009a(16) =4223479870a(17) =11857758532a(18) =24089996163a(19) =84387563433a(20) =236761731724a(21) =481383227645

External references