Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
A268977
Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
Terms
- a(0) =2187a(1) =184320a(2) =5598720a(3) =167226768a(4) =4823705520a(5) =137497776840
External references
- oeis: A268977