A308544 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..12.

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

Adjacent sequences: A308541 A308542 A308543 * A308545 A308546 A308547

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Jun 06 2019

EXTENSIONS

a(12) from Eric W. Weisstein, Jun 20 2019

STATUS

approved