Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
A252412
Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =631a(1) =2414a(2) =8346a(3) =16906a(4) =73925a(5) =267113a(6) =551827a(7) =2435059a(8) =8866727a(9) =18409806a(10) =81776200a(11) =299783435a(12) =624944548a(13) =2793739935a(14) =10304968705a(15) =21560646122a(16) =96944615567a(17) =359575578407a(18) =754760825240
External references
- oeis: A252412