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A307072 Number of simple connected graphs on n nodes with crossing number 1. 1
0, 0, 0, 0, 1, 11, 149, 3008, 71335, 1814021 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
5-node: K_5.
6-node: includes K_{1,2,3}, (5-1)-lollipop, 2 X 3 queen, utility graph K_{3,3}.
CROSSREFS
Cf. A307071 (not necessarily connected graphs).
Cf. A003094 (connected graphs with crossing number 0).
Sequence in context: A175635 A103544 A038141 * A142083 A205085 A068646
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Mar 22 2019
EXTENSIONS
a(9) from Eric W. Weisstein, Apr 17 2019
a(10) from Eric W. Weisstein, Apr 28 2019
STATUS
approved

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Last modified March 4 22:06 EST 2024. Contains 370532 sequences. (Running on oeis4.)