A241843 Number of simple connected graphs on n nodes that are non-chordal.

0, 0, 0, 1, 6, 54, 581, 9503, 249169, 11607032, 1005452874, 164042264045, 50335602558672, 29003480904157108

Offset

1,5

Links

Table of n, a(n) for n=1..14.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644, 2014

Eric Weisstein's World of Mathematics, Chordal Graph

Formula

a(n) = A001349(n) - A048192(n).

a(n) = A287481(n) - A287482(n). - Eric W. Weisstein, May 26 2017

Crossrefs

Cf. A287481 (not-necessarily connected simple non-chordal graphs).

Cf. A287482 (disconnected simple non-chordal graphs).

Sequence in context: A109576 A365843 A366014 * A201352 A186375 A231554

Adjacent sequences: A241840 A241841 A241842 * A241844 A241845 A241846

Keyword

nonn,less

Author

Travis Hoppe and Anna Petrone, Apr 29 2014

Extensions

a(13) and a(14) from formula by Falk Hüffner, Jan 15 2016

Status

approved