login
A343869
Number of unlabeled nonseparable (or 2-connected) planar graphs with n edges.
4
1, 0, 1, 1, 2, 4, 7, 16, 41, 108, 320, 1042, 3575, 13064, 49938, 197729, 805991, 3363084, 14302891, 61813285, 270805177, 1200460492, 5376709415, 24302430375, 110745093999, 508380790741
OFFSET
1,5
COMMENTS
Terms may be computed using the tools geng and planarg in nauty.
LINKS
Brendan McKay and Adolfo Piperno, nauty and Traces
PROG
(nauty)
# count graphs for the sequence by number of vertices v, sum over v afterwards
geng -C $v $n:$n | planarg -q | countg -q # Georg Grasegger, Jun 05 2023
CROSSREFS
Row sums of A343870.
Column sums of A049336(n > 1).
Cf. A002840 (3-connected), A010355, A021103, A046091, A289471, A291841.
Sequence in context: A151378 A192464 A360885 * A137568 A010355 A171880
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, May 04 2021
EXTENSIONS
a(21)-a(26) added by Georg Grasegger, Jun 05 2023
STATUS
approved