Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

A252569

Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

Terms

    a(0) =1069a(1) =1795a(2) =4168a(3) =10885a(4) =34532a(5) =96099a(6) =275252a(7) =896803a(8) =2561903a(9) =7521424a(10) =25021976a(11) =72374863a(12) =214845510a(13) =722910315a(14) =2103362049a(15) =6276229910a(16) =21234443167a(17) =61951956820a(18) =185297812626a(19) =628515657355

External references