A091688 Number of lattice congruences of the weak order on the Coxeter group B_n.

1, 2, 19, 8368, 360350697981

Offset

0,2

Comments

For n=0,1,2,3,4, we have a(n+1) ~ [a(n)]^3 as a very rough order-of-magnitude approximation.

Links

Table of n, a(n) for n=0..4.

N. Reading, Lattice congruences of the weak order.

Crossrefs

Cf. A091687.

Sequence in context: A024229 A094663 A274762 * A306207 A355466 A073444

Adjacent sequences: A091685 A091686 A091687 * A091689 A091690 A091691

Keyword

hard,more,nonn

Author

Nathan Reading (nreading(AT)umich.edu), Jan 28 2004

Status

approved