Number of 3 X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
A269278
Number of 3 X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
Terms
- a(0) =0a(1) =1620a(2) =46872a(3) =1104264a(4) =23549400a(5) =474819408a(6) =9230973192a(7) =174918307032
External references
- oeis: A269278