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

A252434

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

Terms

    a(0) =641a(1) =915a(2) =1142a(3) =1693a(4) =2710a(5) =4342a(6) =6941a(7) =12295a(8) =20379a(9) =34247a(10) =61505a(11) =105195a(12) =178817a(13) =323844a(14) =556603a(15) =948521a(16) =1716416a(17) =2957030a(18) =5043301a(19) =9112051a(20) =15722010a(21) =26825787a(22) =48379614a(23) =83582702a(24) =142663489a(25) =256824515a(26) =444230495a(27) =758496796a(28) =1363061440

External references