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: A078235 A028389 A041603 this_sequence A063168 A103090 A097554

Adjacent sequences: A018196 A018197 A018198 this_sequence A018200 A018201 A018202

nonn

njas