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A051504 Number of asymmetric digraphs with n nodes. 2
1, 1, 1, 7, 136, 8001, 1445297 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 231.

P. K. Stockmeyer, The enumeration of graphs with prescribed automorphism group, Dissertation, Univ. of Michigan, Ann Arbor, 1971.

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Cf. A000273 (digraphs), A003400 (asymmetric graphs), A030242 (asymmetric relations)

Sequence in context: A243684 A260535 A220380 * A058881 A100520 A221342

Adjacent sequences:  A051501 A051502 A051503 * A051505 A051506 A051507

KEYWORD

hard,nonn,nice

AUTHOR

Vladeta Jovovic

EXTENSIONS

a(6) from Christian G. Bower Dec 15 1999.

STATUS

approved

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)