Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

A252046

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

Terms

    a(0) =1552a(1) =2440a(2) =2812a(3) =3494a(4) =5192a(5) =7642a(6) =10084a(7) =15096a(8) =22090a(9) =33394a(10) =51822a(11) =80300a(12) =121316a(13) =192672a(14) =295944a(15) =470038a(16) =746074a(17) =1178492a(18) =1862412a(19) =2996984a(20) =4730680a(21) =7662842a(22) =12351324a(23) =19845934a(24) =32072160a(25) =52188856a(26) =84194786a(27) =137851756

External references