0,2

J. I. Brown and S. Watson, The number of complements of a topology on n points is at least 2^n (except for some special cases), Discr. Math., 154 (1996), 27-39.

Sequence in context: A046416 A042879 A042495 this_sequence A079606 A067926 A075224

Adjacent sequences: A018195 A018196 A018197 this_sequence A018199 A018200 A018201

nonn

njas