Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

A220559

Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Terms

    a(0) =8a(1) =149a(2) =2604a(3) =45966a(4) =810778a(5) =14298089a(6) =252139015a(7) =4446314533a(8) =78407942556

External references