A243785 Number of unlabeled simple connected graphs with n nodes that are chordal but not integral.

0, 0, 1, 4, 12, 56, 267, 1605, 11909, 109525

Offset

1,4

Links

Table of n, a(n) for n=1..10.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs.

Travis Hoppe and Anna Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

Eric Weisstein's World of Mathematics, Chordal Graph.

Eric Weisstein's World of Mathematics, Integral Graph.

Formula

a(n) = A048192(n) - A243786(n).

Crossrefs

Cf. A048192 (connected chordal graphs), A241842 (non-integral graphs).

Cf. A243786.

Sequence in context: A295496 A164575 A124004 * A019266 A009114 A144012

Adjacent sequences: A243782 A243783 A243784 * A243786 A243787 A243788

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 27 2014

Status

approved