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Search: id:A098630
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| A098630 |
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Consider the family of multigraphs enriched by the species of parts. Sequence gives number of those multigraphs with n loops and arcs |
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+0
1
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| 1, 4, 60, 1624, 66240, 3711200, 269670208, 24435113216, 2682916389632, 349223324753408, 52965538033020928
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OFFSET
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0,2
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REFERENCES
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G. Paquin, D\'enombrement de multigraphes enrichis, M\'emoire, Math. Dept., Univ. Qu\'ebec \`a Montr\'eal, 2004.
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FORMULA
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a(n) = 2^n*Bell(2*n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 22 2006
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CROSSREFS
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Sequence in context: A013483 A013484 A013485 this_sequence A013502 A099705 A012488
Adjacent sequences: A098627 A098628 A098629 this_sequence A098631 A098632 A098633
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 26 2004
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