anti-antichains?

[Brendan McKay]

Consider the following sequences (which are all the same except
for a small shift):

==================
A000372, A007153, A014466 (Dedekind numbers)

Name: Dedekind numbers: monotone Boolean functions, or nonempty
              antichains of subsets of an n-set

Example: a(2)=6 antichains
  {}, {{}}, {{},{1}}, {{},{2}}, {{},{1},{2}}, {{},{1},{2},{1,2}}
==================

Those aren't antichains!  An antichain (in this case) is a collection
of sets of which none is a subset of another.  The correct example is
  {}, {{}}, {{1}}, {{2}}, {{1,2}}, {{1},{2}}

Can some kind person please submit the changes?  At the same time,
the reference to D. H. Wiedemann, personal communication, can be
replaced by

D. H. Wiedemann, A computation of the eighth Dedekind number,
Order 8 (1991) 5-6.


Brendan.