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A003616
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Symmetries in unrooted 4-trees on n+1 vertices.
(Formerly M0377)
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0
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1, 2, 2, 8, 28, 20, 43, 143, 249, 546, 1223, 2703, 8107, 18085, 44013, 114919, 327712, 800937, 2146066, 5827711, 15923828, 43886143, 121888966, 340209504, 955859391, 2700771322, 7652412896, 21784431688, 62248194140, 178463482459
(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 trees
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CROSSREFS
| Sequence in context: A113464 A054093 A098557 * A079895 A053047 A076143
Adjacent sequences: A003613 A003614 A003615 * A003617 A003618 A003619
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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