A018204 Possible numbers of complements of topologies on 13 points.

1, 12, 121, 1000, 2048, 4095, 6561, 8192

Offset

0,2

Links

Table of n, a(n) for n=0..7.

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: A337202 A299823 A222634 * A176779 A098297 A037543

Adjacent sequences: A018201 A018202 A018203 * A018205 A018206 A018207

Keyword

nonn,more

Author

N. J. A. Sloane

Status

approved