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

A252315

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

Terms

    a(0) =2498a(1) =1974a(2) =1918a(3) =2579a(4) =5029a(5) =10448a(6) =25875a(7) =68772a(8) =184492a(9) =504259a(10) =1385765a(11) =3809159a(12) =10487354a(13) =28887477a(14) =79569808a(15) =219199326a(16) =603879357a(17) =1663644827a(18) =4583262341a(19) =12626722128a(20) =34786167551a(21) =95834699674a(22) =264021398318

External references