Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

A220550

Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

Terms

    a(0) =8a(1) =401a(2) =14556a(3) =565061a(4) =21668208a(5) =832899775a(6) =32001129185

External references