A005963 Number of restricted hexagonal polyominoes with n cells.

0, 0, 1, 2, 10, 45, 210, 1002, 4883, 23797, 116518, 571471

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

References

• A. T. Balaban, Enumeration of Cyclic Graphs, pp. 63-105 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976; see p. 75.
• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Crossrefs

Equals A000228 - A002216.

Cf. A036359, A002216, A005963, A000228, A001998.