A308557 Number of connected ungraceful graphs on n nodes.

0, 0, 0, 0, 3, 6, 34, 148

Offset

1,5

Links

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

Eric Weisstein's World of Mathematics, Graceful Graph

Formula

a(n) = A001349(n) - A308549(n). - Pontus von Brömssen, Dec 29 2024

Crossrefs

Cf. A001349, A308549, 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