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: A012564 A012442 A037097 this_sequence A098297 A037543 A037487

Adjacent sequences: A018201 A018202 A018203 this_sequence A018205 A018206 A018207

nonn

njas