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A308544
Number of (not necessarily connected) graceful graphs on n edges with no isolated points.
0
1, 1, 3, 5, 12, 37, 112, 340, 1078, 3620, 12737, 46376
OFFSET
1,3
LINKS
Eric Weisstein's World of Mathematics, Graceful Graph
Eric Weisstein's World of Mathematics, Isolated Point
EXAMPLE
1 edge: P_2
2 edges: P_3
3 edges: K_1,3 (claw), P_4, C_3
4 edges: fork graph, P_5, paw graph, C_4, S_5
CROSSREFS
Sequence in context: A243013 A191636 A267337 * A307142 A291936 A307146
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, Jun 06 2019
EXTENSIONS
a(12) from Eric W. Weisstein, Jun 20 2019
STATUS
approved