

A235604


Number of equivalence classes of lattices of subsets of the power set 2^[n].


0




OFFSET

0,4


COMMENTS

This is also the number of inequivalent atomic lattices on n atoms or inequivalent strict closure systems under T1 separation axiom on n elements.  Dmitry I. Ignatov, Sep 27 2022


LINKS



CROSSREFS

The number of inequivalent closure operators on a set of n elements where all singletons are closed is given in A355517.
The number of all strict closure operators is given in A102894.
For T_1 closure operators, see A334254.


KEYWORD

nonn,more,hard


AUTHOR



EXTENSIONS



STATUS

approved



