A308556 Number of (not necessarily connected) ungraceful graphs on n nodes.

0, 1, 2, 4, 12, 30, 85, 300

Offset

1,3

Links

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

Eric Weisstein's World of Mathematics, Graceful Graph

Crossrefs

Cf. A308557 (connected ungraceful graphs).

Sequence in context: A059412 A079472 A366590 * A148186 A006948 A148187

Adjacent sequences: A308553 A308554 A308555 * A308557 A308558 A308559

Keyword

nonn,more

Author

Eric W. Weisstein, Jun 07 2019

Extensions

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

Status

approved