Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.

A252468

Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.

Terms

    a(0) =1299a(1) =813a(2) =1741a(3) =5367a(4) =18175a(5) =62391a(6) =213791a(7) =735125a(8) =2535533a(9) =8732005a(10) =30044255a(11) =103433231a(12) =356211387a(13) =1226555493a(14) =4222869449a(15) =14539251555a(16) =50061141995a(17) =172368825763a(18) =593481175837

External references