Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

A220620

Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

Terms

    a(0) =21a(1) =4565a(2) =624227a(3) =93905509a(4) =13864972277

External references