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A063682 Number of 2-trees rooted at an asymmetric end-edge. 0
0, 1, 3, 13, 52, 229, 1024, 4749, 22454, 108299, 529896, 2625903, 13148268, 66428383, 338197609, 1733399552, 8936746984, 46315049443, 241146306914, 1260805087503, 6616786338256, 34843842405490, 184057255372576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 75, Eq. (3.5.4).

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Cf. A058870, A058866, A054581.

Sequence in context: A037772 A037660 A122600 * A082376 A065059 A198584

Adjacent sequences:  A063679 A063680 A063681 * A063683 A063684 A063685

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Aug 22 2001

STATUS

approved

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Last modified November 15 18:10 EST 2018. Contains 317240 sequences. (Running on oeis4.)