Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal or antidiagonal neighbors.

A220630

Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal or antidiagonal neighbors.

Terms

    a(0) =1a(1) =16a(2) =158a(3) =1665a(4) =17527a(5) =183961a(6) =1932695a(7) =20301254a(8) =213251377a(9) =2240062837a(10) =23530357757a(11) =247170637157

External references