Number of ways to reciprocally link elements of an n X 7 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

A220552

Number of ways to reciprocally link elements of an n X 7 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

Terms

    a(0) =21a(1) =5536a(2) =940432a(3) =174911750a(4) =32001129185

External references