OFFSET
1,3
LINKS
Eric Weisstein's World of Mathematics, Connected Graph
Eric Weisstein's World of Mathematics, Graceful Graph
Eric Weisstein's World of Mathematics, Vertex Count
EXAMPLE
1 node: K_1
2 nodes: P_2
3 nodes: P_3, C_3
4 nodes: K_1,3 (claw), K_4-e, P_4, paw graph, C_4, K_4
5 nodes: K_2,3, K_1,1,3, K_1,1,1,2, P_5, S_5, W_5 (and 12 more)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Jun 06 2019
EXTENSIONS
a(8) from Eric W. Weisstein, Aug 16 2019
STATUS
approved