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A000951
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Number of forests with n nodes and height at most 4.
(Formerly M3026 N1226)
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12
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1, 3, 16, 125, 1296, 16087, 229384, 3687609, 66025360, 1303751051, 28151798544, 659841763957, 16681231615816, 452357366282655, 13095632549137576, 403040561722348913, 13138626717852194976, 452179922268565180819
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| J. Riordan, Forests of labeled trees, J. Combin. Theory, 5 (1968), 90-103.
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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FORMULA
| E.g.f.: exp(x*exp(x*exp(x*exp(x*exp(x))))).
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CROSSREFS
| Cf. A000248, A000949, A000950, A052512-A052514.
Sequence in context: A188417 A157457 A000950 * A000272 A159594 A188805
Adjacent sequences: A000948 A000949 A000950 * A000952 A000953 A000954
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 07 2001
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