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A002985
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Number of trees in an n-node wheel.
(Formerly M0783)
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0
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1, 1, 1, 2, 3, 6, 11, 20, 36, 64, 108, 179, 292, 464, 727, 1124, 1714, 2585, 3866, 5724, 8418, 12290, 17830, 25713, 36898, 52664, 74837, 105873, 149178, 209364, 292793
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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REFERENCES
| F. Harary, P. E. O'Neil, R. C. Read and A. J. Schwenk, The number of trees in a wheel, in D. J. A. Welsh and D. R. Woodall, editors, Combinatorics. Institute of Mathematics and Its Applications. Southend-on-Sea, England, 1972, pp. 155-163.
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: A131269 A047081 A090167 * A093608 A079976 A017992
Adjacent sequences: A002982 A002983 A002984 * A002986 A002987 A002988
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KEYWORD
| nonn,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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