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A054358
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Number of unlabeled asymmetric 2-ary cacti having n polygons.
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0
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1, 1, 0, 1, 2, 8, 18, 61, 170, 538, 1654, 5344, 17252, 57146, 190786, 646305, 2209050, 7626164, 26532732, 93013852, 328196780, 1165060170, 4158266282, 14915635376, 53745892932, 194477856048, 706436256598, 2575316698792, 9419568272632
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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LINKS
| Miklos Bona, Michel Bousquet, Gilbert Labelle, Pierre Leroux, Enumeration of m-ary cacti, Advances in Applied Mathematics, 24 (2000), 22-56 (pdf, dvi).
Index entries for sequences related to cacti
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CROSSREFS
| Sequence in context: A136201 A058082 A005675 * A074128 A061226 A134827
Adjacent sequences: A054355 A054356 A054357 * A054359 A054360 A054361
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KEYWORD
| nonn
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AUTHOR
| Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 04 2007
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