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Search: id:A054422
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| A054422 |
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Number of unlabeled asymmetric ternary cacti having n triangles. |
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+0
1
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| 1, 1, 0, 3, 10, 54, 222, 1107, 5346, 27399, 142770, 764967, 4170672, 23140813, 130189302, 741650172, 4270501218, 24825326196, 145534796520, 859627488963, 5112003992610, 30586307195304, 184023393204654, 1112800162657899
(list; graph; listen)
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OFFSET
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0,4
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LINKS
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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
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Sequence in context: A133148 A135829 A071895 this_sequence A074503 A034234 A081721
Adjacent sequences: A054419 A054420 A054421 this_sequence A054423 A054424 A054425
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KEYWORD
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nonn,easy
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AUTHOR
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Simon Plouffe (plouffe(AT)math.uqam.ca) Mar 15 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Mar 16 2000.
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