A030243 Number of nonisomorphic relations with a nontrivial symmetry.

0, 0, 4, 34, 580, 23702

Offset

0,3

Links

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

Crossrefs

Equals A000595-A030242.

Sequence in context: A158961 A134354 A333981 * A222789 A326206 A088077

Adjacent sequences: A030240 A030241 A030242 * A030244 A030245 A030246

Keyword

nonn,more

Author

Christian G. Bower

Status

approved