A003613 Number of symmetries in planted (1,4) trees on 3n-1 vertices. (Formerly M4102)

1, 6, 12, 96, 1560, 4848, 28848, 248352, 1446240, 12905664, 99071040, 649236480, 4924099200, 49007023872, 304778309376, 2301818168832, 18389782387200, 138110895596544, 1094304243348480, 8691945066848256, 68039592521668608

Offset

1,2

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).

Links

Table of n, a(n) for n=1..21.

Kathleen A. McKeon, Letter to N. J. A. Sloane, July 25 1991

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. [Annotated scanned copy]

Index entries for sequences related to rooted trees

Index entries for sequences related to trees

Crossrefs

Sequence in context: A128953 A181597 A002898 * A099767 A191462 A340060

Adjacent sequences: A003610 A003611 A003612 * A003614 A003615 A003616

Keyword

nonn

Author

N. J. A. Sloane, Mira Bernstein

Status

approved