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A213430 Related to number of topologies.
(Formerly N0663)
0
1, 2, 6, 26, 159, 1347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Research Bulletin of East Panjab University, Vol. 19 (1968), p. 240 (author and title needed, also a more precise definition).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

LINKS

Table of n, a(n) for n=1..6.

CROSSREFS

Sequence in context: A099760 A112934 A135922 * A103367 A047863 A180349

Adjacent sequences:  A213427 A213428 A213429 * A213431 A213432 A213433

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 11 2012

STATUS

approved

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Last modified March 3 14:58 EST 2021. Contains 341762 sequences. (Running on oeis4.)