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

A252153

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

Terms

    a(0) =3583a(1) =2702a(2) =4988a(3) =8425a(4) =15460a(5) =29825a(6) =58792a(7) =116276a(8) =229960a(9) =457196a(10) =909868a(11) =1810124a(12) =3610156a(13) =7203020a(14) =14368492a(15) =28697612a(16) =57327052a(17) =114505100a(18) =228854092a(19) =457436876a(20) =914279500a(21) =1827936716a(22) =3654790348a(23) =7307206604a(24) =14611927756

External references