

A307072


Number of simple connected graphs on n nodes with crossing number 1.


1




OFFSET

1,6


LINKS



EXAMPLE

5node: K_5.
6node: includes K_{1,2,3}, (51)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).


KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



