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A098631
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Consider the family of multigraphs enriched by the species of parts. Sequence gives number of those multigraphs with n arcs.
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0
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1, 2, 28, 696, 26512, 1402656, 97017792, 8418174848, 889241719040, 111774837350912, 16420543334734848, 2778708477919836160, 535183812199464341504, 116142946557502449852416
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| G. Paquin, D\'enombrement de multigraphes enrichis, M\'emoire, Math. Dept., Univ. Qu\'ebec \`a Montr\'eal, 2004.
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FORMULA
| a(n) = 2^n*A020556(n). - Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 11 2005
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CROSSREFS
| Sequence in context: A012745 A143585 A151332 * A089836 A090249 A009256
Adjacent sequences: A098628 A098629 A098630 * A098632 A098633 A098634
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 26 2004
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 11 2005
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