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A165950 Number of acyclic digraphs on [n] with a single source, a single sink and no isolated vertices. 0
2, 12, 216, 10600, 1306620, 384471444, 261548825328, 402632012394000, 1381332938730123060, 10440873023366019273820, 172308823347127690038311496 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..12.

Antoine Genitrini, Martin P├ępin, and Alfredo Viola, Unlabelled ordered DAGs and labelled DAGs: constructive enumeration and uniform random sampling, hal-03029381 [math.CO], [cs.DM], [cs.DS], 2020.

Ira Gessel, Counting Acyclic Digraphs by Sources and Sinks

CROSSREFS

Sequence in context: A153302 A123118 A182161 * A208651 A083667 A092124

Adjacent sequences:  A165947 A165948 A165949 * A165951 A165952 A165953

KEYWORD

more,nonn

AUTHOR

Vladeta Jovovic, Oct 01 2009

STATUS

approved

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Last modified October 20 21:16 EDT 2021. Contains 348119 sequences. (Running on oeis4.)