Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

A252576

Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

Terms

    a(0) =742a(1) =868a(2) =1795a(3) =3441a(4) =8980a(5) =23007a(6) =47737a(7) =133142a(8) =358343a(9) =747913a(10) =2133162a(11) =5930143a(12) =12407892a(13) =35927539a(14) =102193578a(15) =214180250a(16) =626625460a(17) =1809891284a(18) =3797310562a(19) =11184658108a(20) =32620331477a(21) =68486288857a(22) =202566746459a(23) =594329457551

External references