Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.

A252681

Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.

Terms

    a(0) =750a(1) =630a(2) =1005a(3) =1525a(4) =3185a(5) =6645a(6) =10933a(7) =24685a(8) =54782a(9) =91577a(10) =211344a(11) =479362a(12) =805863a(13) =1878870a(14) =4316287a(15) =7281075a(16) =17071625a(17) =39565761a(18) =66917777a(19) =157482493a(20) =367387630a(21) =622655713a(22) =1469264172a(23) =3444892538a(24) =5848122279a(25) =13827395422

External references