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

A252411

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

Terms

    a(0) =426a(1) =1224a(2) =3302a(3) =6231a(4) =21819a(5) =63428a(6) =122653a(7) =433272a(8) =1264088a(9) =2446973a(10) =8647751a(11) =25240256a(12) =48858289a(13) =172693010a(14) =504163906a(15) =975786403a(16) =3449387269a(17) =10072591598a(18) =19492346563a(19) =68913269330a(20) =201282072654a(21) =389463616027

External references