Number of (n+2)X(4+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.

A252570

Number of (n+2)X(4+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) =1694a(1) =3441a(2) =9051a(3) =25882a(4) =88844a(5) =263046a(6) =802760a(7) =2655311a(8) =7860183a(9) =24273030a(10) =79767276a(11) =236117012a(12) =730342433a(13) =2398390660a(14) =7098703610a(15) =21963448780a(16) =72127785139a(17) =213445574577a(18) =660482900457

External references