Number of ways to reciprocally link elements of an 4Xn array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

A220741

Number of ways to reciprocally link elements of an 4Xn array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =8a(2) =72a(3) =712a(4) =7369a(5) =78418a(6) =824965a(7) =8705465a(8) =91846148a(9) =969455702a(10) =10232057400a(11) =107999532301

External references