Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

A220729

Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =16a(2) =534a(3) =29310a(4) =1485872a(5) =78144195a(6) =4067687187a(7) =212706905400

External references