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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

User: Bernhard Ganter

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Bernhard Ganter has authored 1 sequences.

A047684 Number of reduced contexts on n unlabeled objects.

Original entry on oeis.org

1, 2, 9, 126, 13596, 108096891
Offset: 1

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Author

Bernhard Ganter (ganter(AT)math.tu-dresden.de)

Keywords

Comments

Equivalently, number of closure systems on n points, up to isomorphism.

References

  • Bernhard Ganter, Rudolf Wille: Formal Concept Analysis, Springer-Verlag, 1999, ISBN 3-540-62771-5, p. 59.

Extensions

a(6) from Klaus Hoffmann, Jan 01 2016

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