Number of nX4 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.
A269105
Number of nX4 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.
Terms
- a(0) =216a(1) =15540a(2) =872460a(3) =43964700a(4) =2085484068a(5) =95166487524
External references
- oeis: A269105