Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.

A252561

Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.

Terms

    a(0) =832a(1) =1477a(2) =4006a(3) =8329a(4) =29158a(5) =88899a(6) =189777a(7) =680323a(8) =2097950a(9) =4459797a(10) =16207003a(11) =50241432a(12) =106284365a(13) =390413041a(14) =1215215993a(15) =2560430019a(16) =9487153047a(17) =29626334151a(18) =62221453445a(19) =232146488313a(20) =726802890892

External references