A046911 Number of isomorphism classes of irreducible quasiorders with n labeled points.

1, 1, 2, 4, 14, 62, 373, 2722

Offset

0,3

References

J. A. Wright, There are 718 6-point topologies, quasi-orderings and transgraphs, Notices Amer. Math. Soc., 17 (1970), p. 646, Abstract #70T-A106.

Links

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

J. A. Wright, Letter to N. J. A. Sloane, Apr 06 1972, listing 18 sequences

Crossrefs

Cf. A046912.

Sequence in context: A132880 A019537 A384382 * A089127 A132852 A387511

Adjacent sequences: A046908 A046909 A046910 * A046912 A046913 A046914

Keyword

nonn,nice

Author

John A. Wright

Status

approved