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A003097 Critical connected topologies with n points.
(Formerly M2677)
0
1, 3, 7, 20, 52, 157, 458, 1436, 4531, 14794, 48944, 165314 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=2..13.

S. K. Das, On the enumeration of finite maximal connected topologies, J. Combin. Theory, B 15 (1973), 184-199.

CROSSREFS

Sequence in context: A271894 A066315 A058499 * A109220 A293734 A018034

Adjacent sequences:  A003094 A003095 A003096 * A003098 A003099 A003100

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(8)-a(13) from Sean A. Irvine, Feb 01 2015

STATUS

approved

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Last modified March 19 17:05 EDT 2019. Contains 321330 sequences. (Running on oeis4.)