A115571 Array read by rows: row n (n>= 1) gives the Betti numbers for the n-th element of the affine Weyl group of type A2_tilde (in Goresky's standard ordering).

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, 2, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 4, 3, 1, 1, 3, 5, 4, 1, 1, 3, 4, 3, 1, 1, 3, 4, 3, 1, 1, 3, 5, 4, 1, 1, 3, 4, 3, 1, 1, 3, 5, 4, 1, 1, 3, 5

Offset

1,9

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 2 1
1 2 1
1 2 1
1 2 1
1 2 1
1 2 1
1 2 2 1

Crossrefs

Sequence in context: A152847 A152846 A152845 * A333805 A152844 A115580

Adjacent sequences: A115568 A115569 A115570 * A115572 A115573 A115574

Keyword

nonn,tabf

Author

Roger L. Bagula, Mar 02 2006

Status

approved