Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.
A252133
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =134a(1) =156a(2) =431a(3) =1183a(4) =3163a(5) =8684a(6) =24031a(7) =66098a(8) =181896a(9) =501355a(10) =1381325a(11) =3804929a(12) =10482568a(13) =28879979a(14) =79562524a(15) =219191134a(16) =603866443a(17) =1663632329a(18) =4583248173a(19) =12626699534a(20) =34786145503a(21) =95834674276a(22) =264021357876a(23) =727370136485
External references
- oeis: A252133