A005963 Number of restricted hexagonal polyominoes with n cells. (Formerly M1969)

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

Offset

1,4

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).

Links

Table of n, a(n) for n=1..12.

Crossrefs

Equals A000228 - A002216.

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

Sequence in context: A068561 A068484 A192704 * A140588 A137334 A209010

Adjacent sequences: A005960 A005961 A005962 * A005964 A005965 A005966

Keyword

nonn

Author

N. J. A. Sloane

Status

approved