A046909 Number of isomorphism classes of connected irreducible quasiorders with n labeled points.

1, 1, 1, 1, 2, 17, 167, 1672

Offset

0,5

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. A046910.

Sequence in context: A231616 A003419 A126109 * A041879 A011550 A102023

Adjacent sequences: A046906 A046907 A046908 * A046910 A046911 A046912

Keyword

nonn

Author

John A. Wright.

Status

approved