Number of 2 X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
A268905
Number of 2 X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =0a(1) =36a(2) =168a(3) =696a(4) =2664a(5) =9720a(6) =34344a(7) =118584a(8) =402408a(9) =1347192a(10) =4461480a(11) =14644152a(12) =47711592a(13) =154472184a(14) =497428776a(15) =1594323000a(16) =5089079016a(17) =16185567096a(18) =51311691432a(19) =162200044728a(20) =511395045480
External references
- oeis: A268905