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.

Adjacent sequences: A018193 A018194 A018195 this_sequence A018197 A018198 A018199

Sequence in context: A131195 A020217 A141066 this_sequence A072103 A004756 A106840

nonn

njas