A261006 Number of unlabeled connected simplicial complexes with n nodes.

1, 1, 1, 3, 14, 157, 15942, 489980450, 1392195547909966848, 789204635842035012967539870068113408

Offset: 0

Author

N. J. A. Sloane, Aug 13 2015

Keywords

• nonn
• more
• hard

Comments

Inverse Euler transform of A261005 (omitting the a(0) term from A261005).

a(0) could equally well be taken to be 0.

References

• Benoît Jubin, Posting to Sequence Fans Mailing List, Aug 12 2015

Links

• Greg Huber, Letters to N. J. A. Sloane, May 1983 [Annotated, corrected, scanned copy]
• N. J. A. Sloane, Transforms

Crossrefs

Cf. A261005, A006602.

Extensions

a(8)-a(9) from Dmitry I. Ignatov, Nov 26 2023