A307072 Number of simple connected graphs on n nodes with crossing number 1.

0, 0, 0, 0, 1, 11, 149, 3008, 71335, 1814021

Offset: 1

Author

Eric W. Weisstein, Mar 22 2019

Keywords

• nonn
• more

Examples

			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).

Extensions

a(9) from Eric W. Weisstein, Apr 17 2019

a(10) from Eric W. Weisstein, Apr 28 2019