Number of 4Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
A268974
Number of 4Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
Terms
- a(0) =81a(1) =1728a(2) =15552a(3) =136080a(4) =1125360a(5) =9093528a(6) =72081792a(7) =563173128a(8) =4349328912a(9) =33272350344a(10) =252534743280
External references
- oeis: A268974