Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

A220551

Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

Terms

    a(0) =13a(1) =1490a(2) =117022a(3) =9943416a(4) =832899775a(5) =69961268156

External references