Number of ways to reciprocally link elements of an 7 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

A220744

Number of ways to reciprocally link elements of an 7 X n array either to themselves or to exactly two horizontal, diagonal and antidiagonal neighbors, without consecutive collinear links.

Terms

    a(0) =1a(1) =64a(2) =3403a(3) =355883a(4) =32924133a(5) =3287610473a(6) =319803318494

External references