A018197 Possible numbers of complements of topologies on 6 points.

1, 5, 16, 27, 31, 64

Offset

0,2

Links

Table of n, a(n) for n=0..5.

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.

Crossrefs

Sequence in context: A171787 A227586 A335416 * A061874 A341006 A017449

Adjacent sequences: A018194 A018195 A018196 * A018198 A018199 A018200

Keyword

nonn,more

Author

N. J. A. Sloane.

Status

approved