A307071 Number of simple graphs on n nodes with crossing number 1.

0, 0, 0, 0, 1, 12, 162, 3183, 74696, 1892122

Offset: 1

Author

Eric W. Weisstein, Mar 22 2019

Keywords

• nonn
• more

Examples

			5-node: K_5.
6-node: includes K_{1,2,3}, K_5+K_1, (5-1)-lollipop, 2 X 3 queen, utility graph K_{3,3}.
		

Crossrefs

Cf. A005470 (graphs with crossing number 0).

Cf. A307072 (connected graphs with crossing number 1).

Extensions

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

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