Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

A220722

Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =68a(2) =1819a(3) =52189a(4) =1485872a(5) =42378036a(6) =1208447287a(7) =34459871148a(8) =982649830527

External references