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A122689
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Irregular triangle read by rows giving numbers of azulenoid isomers (see Brunvoll et al. for precise definition).
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0
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1, 1, 3, 1, 14, 6, 2, 79, 43, 14, 3, 459, 326, 131, 37, 8, 1, 2800, 2442, 1172, 418, 108, 20, 1
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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REFERENCES
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J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Azulenoids, MATCH, No. 34, 1996, 91-108.
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LINKS
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Table of n, a(n) for n=1..24.
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EXAMPLE
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Triangle begins:
1
1
3 1
14 6 2
79 43 14 3
459 326 131 37 8 1
2800 2442 1172 418 108 20 1
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CROSSREFS
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Sequence in context: A283285 A283374 A202039 * A283402 A283349 A204121
Adjacent sequences: A122686 A122687 A122688 * A122690 A122691 A122692
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KEYWORD
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nonn,tabf
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AUTHOR
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N. J. A. Sloane, Sep 23 2006
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STATUS
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approved
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