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A003613
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Number of symmetries in planted (1,4) trees on 3n-1 vertices.
(Formerly M4102)
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0
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1, 6, 12, 96, 1560, 4848, 28848, 248352, 1446240, 12905664, 99071040, 649236480, 4924099200, 49007023872, 304778309376, 2301818168832, 18389782387200, 138110895596544, 1094304243348480, 8691945066848256, 68039592521668608
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Kathleen A. McKeon, The expected number of symmetries in locally-restricted trees I, pp. 849-860 of Y. Alavi et al., eds., Graph Theory, Combinatorics and Applications. Wiley, NY, 2 vols., 1991.
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 rooted trees
Index entries for sequences related to trees
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CROSSREFS
| Sequence in context: A128953 A181597 A002898 * A099767 A191462 A080450
Adjacent sequences: A003610 A003611 A003612 * A003614 A003615 A003616
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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