A164101 Number of planar graphs with n nodes and chromatic number 4.

1, 4, 26, 214, 2320, 31858, 518697, 9372645

Offset

4,2

Links

Table of n, a(n) for n=4..11.

Crossrefs

Sequence in context: A349719 A283828 A306028 * A048351 A224734 A143436

Adjacent sequences: A164098 A164099 A164100 * A164102 A164103 A164104

Keyword

nonn

Author

Keith Briggs, Aug 10 2009

Extensions

Added term 9372645 (for n=11), Keith Briggs, Aug 25 2009

Status

approved