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A005963 Number of restricted hexagonal polyominoes with n cells.
(Formerly M1969)
7
0, 0, 1, 2, 10, 45, 210, 1002, 4883, 23797, 116518, 571471 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 19 17:45 EST 2019. Contains 319309 sequences. (Running on oeis4.)