Number of 3 X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
A268973
Number of 3 X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
Terms
- a(0) =27a(1) =336a(2) =2016a(3) =11664a(4) =63792a(5) =339480a(6) =1770048a(7) =9084744a(8) =46050480a(9) =231090264a(10) =1150053408a(11) =5683587048a(12) =27921925008a(13) =136471932792a(14) =664055030016
External references
- oeis: A268973