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A007098
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Number of unlabeled bisectable trees with 2n+1 nodes.
(Formerly M2596)
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1
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1, 1, 3, 6, 19, 47, 140, 374, 1082, 2998, 8574, 24130, 68876, 195587, 559076, 1596651, 4575978, 13122219, 37711998, 108488765, 312577827, 901531937, 2603264050, 7524331268, 21768850808, 63032844756, 182662328945, 529722408615, 1537261773438
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| Harary, Frank; Robinson, Robert W.; Isomorphic factorizations. VIII. Bisectable trees. Combinatorica 4 (1984), no. 2-3, 169-179.
R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1980.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| R. W. Robinson, Table of n, a(n) for n = 0..99
Index entries for sequences related to trees
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CROSSREFS
| Sequence in context: A203797 A019097 A104264 * A148566 A148567 A148568
Adjacent sequences: A007095 A007096 A007097 * A007099 A007100 A007101
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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EXTENSIONS
| a(23) onwards added by N. J. A. Sloane (njas(AT)research.att.com), Oct 19 2006 from the Robinson reference
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