Number of n X n binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.
A268734
Number of n X n binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.
Terms
- a(0) =0a(1) =4a(2) =80a(3) =2876a(4) =200204a(5) =29134076a(6) =9039552112
External references
- oeis: A268734