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: A132111 A085188 A083561 this_sequence A086417 A051215 A034885

Adjacent sequences: A018192 A018193 A018194 this_sequence A018196 A018197 A018198

nonn

njas