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

A252274

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

Terms

    a(0) =322a(1) =948a(2) =2513a(3) =4895a(4) =15739a(5) =43488a(6) =85808a(7) =276544a(8) =765830a(9) =1513196a(10) =4875644a(11) =13503569a(12) =26685485a(13) =85977789a(14) =238124824a(15) =470585534a(16) =1516162514a(17) =4199176596a(18) =8298487316a(19) =26736562424a(20) =74049808021a(21) =146338582343a(22) =471482312899

External references