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Search: id:A130905
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| A130905 |
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E.g.f.: exp(x^2/2)/(1-x). |
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+0
3
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| 1, 1, 1, 3, 9, 39, 195, 1185, 8295, 66465, 598185, 5982795, 65810745, 789739335, 10266611355, 143732694105, 2155990411575, 34495848612225, 586429426407825, 10555729709800275
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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a(n) is also the number of oriented simple graphs on n labeled vertices, such that each weakly connected component with 3 or more vertices is a directed cycle. [From Austin Shapiro (auspex(AT)umich.edu), Apr 17 2009]
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CROSSREFS
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Sequence in context: A149027 A121101 A080635 this_sequence A030799 A058105 A090012
Adjacent sequences: A130902 A130903 A130904 this_sequence A130906 A130907 A130908
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KEYWORD
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nonn
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AUTHOR
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Karol A. Penson (penson(AT)lptl.jussieu.fr), Jun 08 2007
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