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

A252435

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

Terms

    a(0) =602a(1) =688a(2) =1033a(3) =1488a(4) =3057a(5) =6178a(6) =10309a(7) =24196a(8) =50228a(9) =86037a(10) =205258a(11) =426516a(12) =741942a(13) =1784080a(14) =3703542a(15) =6529800a(16) =15796578a(17) =32752826a(18) =58451265a(19) =142157308a(20) =294436272a(21) =531079333a(22) =1297598958a(23) =2685147364a(24) =4887498982a(25) =11988550720

External references