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A309116 a(n) = number of cographs on n points. 0
1, 3, 25, 1299 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

See Haas p. 57 for a note on the nomenclature "cograph".

Haas, Table 1.1 (p. 3) contains the following approximations: a(6) = 1.97 * 10^6, a(7) = 9.43 * 10^10, a(8) = 1.53 * 10^17, a(9) = 1.05 * 10^25.

LINKS

Table of n, a(n) for n=2..5.

Robert Haas, Cographs, arXiv:1905.12627 [math.GM], 2019, p. 3, 57.

CROSSREFS

Sequence in context: A012764 A219275 A101733 * A094815 A246536 A183248

Adjacent sequences:  A309113 A309114 A309115 * A309117 A309118 A309119

KEYWORD

nonn,more

AUTHOR

Michael De Vlieger, Jul 13 2019

STATUS

approved

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Last modified August 18 20:02 EDT 2019. Contains 326109 sequences. (Running on oeis4.)