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Search: id:A007173
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| A007173 |
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Number of simplicial 3-clusters with n cells.
(Formerly M3401)
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+0
2
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| 1, 1, 1, 4, 10, 40, 171, 831, 4147, 21822, 117062, 642600, 3582322, 20256886, 115888201, 669911568, 3907720521, 22979343010, 136107859377, 811430160282
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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Also arises in enumeration of stereo isomers of alkane systems.
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
S. J. Cyvin et al., Enumeration of staggered conformers of alkanes: complete solution ..., J. Molec. Struct., 413 (1997), 237-239.
F. Hering et al., The enumeration of stack polytopes and simplicial clusters, Discrete Math., 40 (1982), 203-217.
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CROSSREFS
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Sequence in context: A149210 A149211 A149212 this_sequence A114918 A149213 A149214
Adjacent sequences: A007170 A007171 A007172 this_sequence A007174 A007175 A007176
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KEYWORD
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nonn,nice,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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