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

A252123

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

Terms

    a(0) =380a(1) =634a(2) =1214a(3) =2149a(4) =4671a(5) =9640a(6) =17053a(7) =37562a(8) =78602a(9) =138803a(10) =310378a(11) =655228a(12) =1151221a(13) =2604314a(14) =5538692a(15) =9687875a(16) =22140202a(17) =47381482a(18) =82547749a(19) =190299482a(20) =409396004a(21) =710842883a(22) =1650780778a(23) =3566811340a(24) =6175729285a(25) =14429116634

External references