Number of 4Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
A268907
Number of 4Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =0a(1) =1344a(2) =12960a(3) =118584a(4) =1004184a(5) =8250912a(6) =66210264a(7) =522241560a(8) =4063962024a(9) =31282792704a(10) =238663638432
External references
- oeis: A268907