Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

A220737

Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =221a(2) =10653a(3) =824965a(4) =60293428a(5) =4335687696a(6) =319803318494

External references