Half the number of n X n binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
A185827
Half the number of n X n binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
Terms
- a(0) =0a(1) =3a(2) =30a(3) =514a(4) =15782a(5) =923808a(6) =91052720a(7) =17200095426
External references
- oeis: A185827