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A308557 Number of connected ungraceful graphs on n nodes. 1
0, 0, 0, 0, 3, 6, 34, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

Eric Weisstein's World of Mathematics, Graceful Graph

CROSSREFS

Cf. A308556 (not necessarily connected ungraceful graphs).

Sequence in context: A186750 A203715 A249875 * A134748 A068904 A309774

Adjacent sequences:  A308554 A308555 A308556 * A308558 A308559 A308560

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Jun 07 2019

EXTENSIONS

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

STATUS

approved

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Last modified October 3 22:17 EDT 2022. Contains 357237 sequences. (Running on oeis4.)