Number of 7Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.
A269220
Number of 7Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.
Terms
- a(0) =0a(1) =7375872a(2) =2039727744a(3) =599456856000
External references
- oeis: A269220