cp's OEIS Frontend

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.

A047684 Number of reduced contexts on n unlabeled objects.

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%I A047684 #10 Jan 02 2016 14:02:35
%S A047684 1,2,9,126,13596,108096891
%N A047684 Number of reduced contexts on n unlabeled objects.
%C A047684 Equivalently, number of closure systems on n points, up to isomorphism.
%D A047684 Bernhard Ganter, Rudolf Wille: Formal Concept Analysis, Springer-Verlag, 1999, ISBN 3-540-62771-5, p. 59.
%K A047684 hard,nonn,nice
%O A047684 1,2
%A A047684 Bernhard Ganter (ganter(AT)math.tu-dresden.de)
%E A047684 a(6) from _Klaus Hoffmann_, Jan 01 2016