Number of n X 2 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
A269270
Number of n X 2 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
Terms
- a(0) =4a(1) =108a(2) =1620a(3) =20412a(4) =236196a(5) =2598156a(6) =27634932a(7) =286978140a(8) =2927177028a(9) =29443957164a(10) =292889889684
External references
- oeis: A269270