Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal or antidiagonal neighbors.

A220631

Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =32a(2) =564a(3) =10695a(4) =201903a(5) =3817452a(6) =72097810a(7) =1362188752a(8) =25734606523a(9) =486186026515

External references