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A000306 Number of trees of diameter 8.
(Formerly M3552 N1440)
0
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; text; internal format)
OFFSET

9,2

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).

LINKS

Table of n, a(n) for n=9..29.

Index entries for sequences related to trees

CROSSREFS

Sequence in context: A098813 A212039 A055485 * A100185 A217324 A129019

Adjacent sequences:  A000303 A000304 A000305 * A000307 A000308 A000309

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified March 23 21:31 EDT 2017. Contains 283985 sequences.