Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

A220600

Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

Terms

    a(0) =1a(1) =117a(2) =25747a(3) =3174778a(4) =352586943a(5) =41011388731

External references