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A046904
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Number of isomorphism classes of posets with n points with property that there is no nonsingelton proper subset T for which x not in T implies x<T or x>T or x incomparable with every element of T.
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1
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OFFSET
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0,6
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REFERENCES
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J. A. Wright, There are 718 6-point topologies, quasi-orderings and transgraphs, Notices Amer. Math. Soc., 17 (1970), p. 646, Abstract #70T-A106.
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LINKS
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Table of n, a(n) for n=0..7.
J. A. Wright, Letter to N. J. A. Sloane, Apr 06 1972, listing 18 sequences
Index entries for sequences related to posets
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CROSSREFS
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A subset of the posets enumerated in A003431. Cf. A046905.
Sequence in context: A229645 A307468 A202824 * A030444 A093877 A151830
Adjacent sequences: A046901 A046902 A046903 * A046905 A046906 A046907
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KEYWORD
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nonn
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AUTHOR
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John A. Wright.
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STATUS
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approved
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