Number of ways to reciprocally link elements of an n X 3 array either to themselves or to exactly one king-move neighbor.
A220639
Number of ways to reciprocally link elements of an n X 3 array either to themselves or to exactly one king-move neighbor.
Terms
- a(0) =1a(1) =3a(2) =40a(3) =369a(4) =3755a(5) =37320a(6) =373177a(7) =3725843a(8) =37213728a(9) =371654153a(10) =3711809483a(11) =37070598992a(12) =370232236753
External references
- oeis: A220639