Number of n X n 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
A268791
Number of n X n 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =0a(1) =22a(2) =248a(3) =4800a(4) =168740a(5) =11138352a(6) =1384570516a(7) =325815151556
External references
- oeis: A268791