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A063692 Number of 2-trees rooted at a triangle with two similar edges. 0
1, 2, 2, 7, 11, 25, 43, 106, 180, 453, 797, 2023, 3632, 9328, 16960, 44036, 80989, 211815, 393098, 1034958, 1934813, 5121356, 9633260, 25615432, 48433926, 129289382, 245554773, 657691061, 1253974468, 3368475942, 6444250241 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 76, Eq. (3.5.16).

LINKS

Table of n, a(n) for n=2..32.

CROSSREFS

Cf. A005750, A058870, A058866, A054581.

Sequence in context: A094116 A079476 A005298 * A292615 A320168 A123209

Adjacent sequences:  A063689 A063690 A063691 * A063693 A063694 A063695

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Aug 23 2001

STATUS

approved

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Last modified November 13 10:55 EST 2018. Contains 317133 sequences. (Running on oeis4.)