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Search: id:A007098
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| A007098 |
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Number of unlabeled bisectable trees with 2n+1 nodes.
(Formerly M2596)
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+0
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; listen)
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OFFSET
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0,3
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REFERENCES
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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.
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LINKS
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R. W. Robinson, Table of n, a(n) for n = 0..99
Index entries for sequences related to trees
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CROSSREFS
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Sequence in context: A108972 A019097 A104264 this_sequence A003162 A129417 A132335
Adjacent sequences: A007095 A007096 A007097 this_sequence A007099 A007100 A007101
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KEYWORD
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nonn
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AUTHOR
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njas, Mira Bernstein (mira(AT)math.berkeley.edu)
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EXTENSIONS
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a(23) onwards added by njas, Oct 19 2006 from the Robinson reference
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