A308549 Number of connected graceful graphs on n vertices.

1, 1, 2, 6, 18, 106, 819, 10969

Offset

1,3

Links

Table of n, a(n) for n=1..8.

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

Sequence in context: A162064 A162056 A347727 * A212653 A323104 A376932

Adjacent sequences: A308546 A308547 A308548 * A308550 A308551 A308552

Keyword

nonn,more

Author

Eric W. Weisstein, Jun 06 2019

Extensions

a(8) from Eric W. Weisstein, Aug 16 2019

Status

approved