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A005963
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Number of restricted hexagonal polyominoes with n cells.
(Formerly M1969)
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7
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0, 0, 1, 2, 10, 45, 210, 1002, 4883, 23797, 116518, 571471
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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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).
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CROSSREFS
| Equals A000228 - A002216.
Cf. A036359, A002216, A005963, A000228, A001998.
Sequence in context: A068561 A068484 A192704 * A140588 A137334 A191813
Adjacent sequences: A005960 A005961 A005962 * A005964 A005965 A005966
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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