A115579 Array read by rows: row n (>= 1) gives the Betti numbers for the n-th element of the affine Weyl group of type A4_tilde (in Goresky's standard ordering).

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 3, 3

Offset

1,13

Comments

There are infinitely many rows.

Links

Table of n, a(n) for n=1..99.

Mark Goresky, Tables of Kazhdan-Lusztig polynomials

Example

Array begins:
1
1 1
1 1
1 1
1 1
1 1
1 2 1
1 2 1
1 2 1

Crossrefs

Cf. A115570-A115583.

Sequence in context: A177702 A131534 A061347 * A115573 A152851 A152849

Adjacent sequences: A115576 A115577 A115578 * A115580 A115581 A115582

Keyword

nonn,tabf

Author

Roger L. Bagula, Mar 04 2006

Status

approved