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A261006 Number of unlabeled connected simplicial complexes with n nodes. 25
1, 1, 1, 3, 14, 157, 15942, 489980450 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

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

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

REFERENCES

BenoƮt Jubin, Posting to Sequence Fans Mailing List, Aug 12 2015

LINKS

Table of n, a(n) for n=0..7.

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

N. J. A. Sloane, Transforms

CROSSREFS

Cf. A261005, A006602.

Sequence in context: A002966 A075654 A330603 * A185238 A090897 A120459

Adjacent sequences:  A261003 A261004 A261005 * A261007 A261008 A261009

KEYWORD

nonn,more,hard

AUTHOR

N. J. A. Sloane, Aug 13 2015

STATUS

approved

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Last modified September 22 07:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)