Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

A220723

Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =221a(2) =14466a(3) =1071230a(4) =78144195a(5) =5717794568a(6) =418227762771

External references