

A076328


Number of connected 9colorable (i.e., chromatic number <= 9) simple graphs on n nodes.


7



1, 1, 2, 6, 21, 112, 853, 11117, 261080, 11716570, 1006700555
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,3


LINKS

Table of n, a(n) for n=1..11.
Eric Weisstein's World of Mathematics, nColorable Graph


FORMULA

Inverse Euler transform of A076321.  Andrew Howroyd, Dec 02 2018


CROSSREFS

Cf. A005142, A076322, A076323, A076324, A076325, A076326, A076327.
Cf. A205568, A076321, A084269.
Cf. A001349. [R. J. Mathar, Sep 21 2008]
Sequence in context: A076326 A076327 A128527 * A128528 A001349 A126060
Adjacent sequences: A076325 A076326 A076327 * A076329 A076330 A076331


KEYWORD

nonn,more


AUTHOR

Eric W. Weisstein, Oct 06 2002


EXTENSIONS

a(10)a(11) from Andrew Howroyd, Dec 02 2018


STATUS

approved



