A018200 Possible numbers of complements of topologies on 9 points.

1, 8, 49, 128, 216, 255, 512

Offset

0,2

Links

Table of n, a(n) for n=0..6.

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: A304468 A272713 A316285 * A306049 A317226 A329051

Adjacent sequences: A018197 A018198 A018199 * A018201 A018202 A018203

Keyword

nonn,more

Author

N. J. A. Sloane

Status

approved