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Search: id:A098724
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| 1, 1, 21, 3136, 2000376, 4032758016, 21047953604832, 246803372284575744, 5848571832825267643383, 258055182353934343170048256, 19860857243854539712080765166683, 2528286565488663166137820705009434624
(list; graph; listen)
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OFFSET
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5,3
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COMMENT
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Comment from Saverio Caminiti and Emanuele G. Fusco (fusco(AT)di.uniroma1.it), Sep 18 2007: There is a flaw in the paper by Lamathe that we point out in our contribution. This sequence does not give the number of labeled 5-arch graphs on n nodes. The correct sequence is given in our paper.
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REFERENCES
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B. Leclerc, Graphes d'arches, Math. Sci. Hum. 157 (2002), 27-48.
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LINKS
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C. Lamathe, The number of labeled k-arch graphs.
Saverio Caminiti and Emanuele G. Fusco, On the Number of Labeled k-arch Graphs, Journal of Integer Sequences, Vol 10 (2007), Article 07.7.5
C. Lamathe, The number of labeled k-arch graphs, Journal of Integer Sequences, Vol. 7 (2004), Article 04.3.1.
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MAPLE
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with(combinat); seq( binomial(n, 5)^(n-6), n=5..19 );
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CROSSREFS
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Cf. A098721, A098722, A098723
Sequence in context: A098375 A095154 A018238 this_sequence A078395 A153833 A055416
Adjacent sequences: A098721 A098722 A098723 this_sequence A098725 A098726 A098727
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KEYWORD
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easy,nonn
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AUTHOR
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Cedric Lamathe (lamathe(AT)loria.fr), Sep 30 2004
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