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A000306
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Number of trees of diameter 8.
(Formerly M3552 N1440)
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0
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1, 4, 19, 66, 219, 645, 1813, 4802, 12265, 30198, 72396, 169231, 387707, 871989, 1930868, 4215615, 9091410, 19389327, 40944999, 85691893, 177898521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 9,2
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REFERENCES
| J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Index entries for sequences related to trees
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CROSSREFS
| Sequence in context: A134507 A098813 A055485 * A100185 A129019 A167247
Adjacent sequences: A000303 A000304 A000305 * A000307 A000308 A000309
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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