A126738 Number of connected graphs on n nodes with chromatic number 4.

0, 0, 0, 1, 3, 26, 282, 5009, 149551, 7694428, 667036310

Offset

1,5

Links

Table of n, a(n) for n=1..11.

Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

A diagonal of triangle in A126736.

Sequence in context: A048861 A053972 A204561 * A283298 A259610 A326396

Adjacent sequences: A126735 A126736 A126737 * A126739 A126740 A126741

Keyword

nonn

Author

N. J. A. Sloane, Feb 16 2007

Extensions

a(11) from Michael Sollami, Jan 29 2012

Status

approved