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A060337 Number of labeled acyclic digraphs with n nodes containing exactly n-2 points of in-degree zero. 0
15, 198, 1610, 10575, 61845, 336924, 1751076, 8801325, 43141175, 207347778, 980828238, 4578689115, 21135851625, 96628899960, 438068838536, 1971349880985, 8813183238315, 39169902510270, 173172640973010 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 19, (1.6.4).

R. W. Robinson, Counting labeled acyclic digraphs, pp. 239-273 of F. Harary, editor, New Directions in the Theory of Graphs. Academic Press, NY, 1973.

LINKS

Table of n, a(n) for n=3..21.

CROSSREFS

Third column of A058876, Cf. A003025, A003026.

Sequence in context: A098300 A185899 A152587 * A180789 A078264 A322914

Adjacent sequences:  A060334 A060335 A060336 * A060338 A060339 A060340

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Apr 10 2001

STATUS

approved

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Last modified June 6 17:01 EDT 2020. Contains 334829 sequences. (Running on oeis4.)