Number of 7Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
A269041
Number of 7Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =0a(1) =25272a(2) =357756a(3) =8277072a(4) =159397596a(5) =3266423688a(6) =63310818360
External references
- oeis: A269041