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A052171
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Number of directed multigraphs with loops on infinite set of nodes with n arcs.
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7
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1, 2, 11, 52, 296, 1724, 11060, 74527, 533046, 3999187, 31412182, 257150093, 2188063401, 19299062896, 176059781439, 1657961491087, 16089088019098, 160643776819423, 1648068916722737, 17351137043998280, 187255329043638437, 2069426416836401375, 23397468305569068113, 270406562951254606048, 3191908298072118225550, 38454691427657997701136
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums of A136564, limiting values of A138107. - Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 13 2008
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LINKS
| J.-C. Novelli, J.-Y. Thibon and N. M. Thiery, Algebres de Hopf de graphes, C.R. Acad. Sci. Paris (Comptes Rendus Mathematique), 339 (2004), 607-610.
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CROSSREFS
| Cf. A050535, A007717, A005993, A050927, A050929.
Cf. A104209.
Sequence in context: A110308 A027201 A026933 * A168022 A030281 A063767
Adjacent sequences: A052168 A052169 A052170 * A052172 A052173 A052174
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 26 2000
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EXTENSIONS
| a(16)-a(25) from Max Alekseyev (maxale(AT)gmail.com), Jun 21 2011
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