Number of nX6 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
A268637
Number of nX6 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
Terms
- a(0) =240a(1) =7128a(2) =163878a(3) =3440052a(4) =68710116a(5) =1328460312a(6) =25093766490a(7) =465757993812
External references
- oeis: A268637