A115579 - OEIS

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).

%I #4 Mar 12 2014 16:41:38

%S 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,

%T 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,

%U 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

%N 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).

%C There are infinitely many rows.

%H Mark Goresky, <a href="http://www.math.ias.edu/~goresky/tables.html">Tables of Kazhdan-Lusztig polynomials</a>

%e Array begins:

%e 1

%e 1 1

%e 1 2 1

%Y Cf. A115570-A115583.

%K nonn,tabf

%O 1,13

%A _Roger L. Bagula_, Mar 04 2006