A018196 Possible numbers of complements of topologies on 5 points.

1, 4, 8, 9, 15, 32

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• more
• fini

Links

• 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

Cf. A000798.