Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

A220731

Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly two horizontal, diagonal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =64a(2) =9667a(3) =3751888a(4) =1208447287a(5) =418227762771

External references