OFFSET
1,3
LINKS
Eric Weisstein's World of Mathematics, Chordless Graph
Eric Weisstein's World of Mathematics, Connected Graph
FORMULA
Inverse Euler transform of A287694. - Andrew Howroyd, Nov 03 2017
EXAMPLE
1 node: K_1 (1 graph)
2 nodes: P_2 = K_2 (1 graph)
3 nodes: P_3, C_3 = K_3 (2 graphs)
4 nodes: S_4 = K_{1,3}, P_4, paw graph, C_4 (4 graphs)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, May 30 2017
STATUS
approved