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A049368
Number of connected triangle-free planar graphs with n nodes.
1
1, 1, 1, 3, 6, 18, 55, 230, 1063, 6161, 41004, 312782, 2618995, 23549346, 222764216
OFFSET
1,4
LINKS
F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 9766535.
CROSSREFS
Sequence in context: A112572 A089325 A110593 * A152733 A215455 A211894
KEYWORD
nonn,nice,hard
AUTHOR
EXTENSIONS
a(12)-a(15) added using tinygraph by Falk Hüffner, May 09 2019
STATUS
approved