Number of n_X_4 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
A268635
Number of n_X_4 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.
Terms
- a(0) =36a(1) =504a(2) =5178a(3) =47640a(4) =412740a(5) =3440052a(6) =27906474a(7) =221913216a(8) =1737860310a(9) =13445785116a(10) =103012659468a(11) =782824552488
External references
- oeis: A268635