Number of (n+2) X (1+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.
A252081
Number of (n+2) X (1+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.
Terms
- a(0) =64a(1) =130a(2) =295a(3) =687a(4) =1591a(5) =3650a(6) =8389a(7) =19412a(8) =45002a(9) =104255a(10) =241737a(11) =561451a(12) =1305496a(13) =3038129a(14) =7076836a(15) =16500354a(16) =38507303a(17) =89941465a(18) =210246081a(19) =491853090a(20) =1151508703a(21) =2697778070a(22) =6324654030a(23) =14836947029a(24) =34826937451a(25) =81796528951
External references
- oeis: A252081