Number of n X 2 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totaling four exactly once.
A269823
Number of n X 2 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totaling four exactly once.
Terms
- a(0) =5a(1) =216a(2) =3096a(3) =39784a(4) =462680a(5) =5145736a(6) =55265336a(7) =580002280a(8) =5978552216a(9) =60784629832a(10) =611189228792
External references
- oeis: A269823