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

A252618

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

Terms

    a(0) =1042a(1) =2817a(2) =7031a(3) =17762a(4) =58239a(5) =156499a(6) =437805a(7) =1506801a(8) =4136820a(9) =11865455a(10) =41976597a(11) =116407007a(12) =337378745a(13) =1211267119a(14) =3374947162a(15) =9828010763a(16) =35545348591a(17) =99260624406a(18) =289689365514

External references