A063692 Number of 2-trees rooted at a triangle with two similar edges.

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

Offset: 2

Author

Vladeta Jovovic, Aug 23 2001

Keywords

• nonn

References

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

Crossrefs

Cf. A005750, A058870, A058866, A054581.