Abstract
Let ℋ = ℋ
ℂ, −1
(
n
) be the Hecke algebra of the symmetric group
n
. For partitions λ and ν with ν 2 − regular, define the Specht module S(λ) and the irreducible module D(ν). Define d
λν
= [S(λ): D(ν)] to be the composition multiplicity of D(ν) in S(λ). In this paper we compute the decomposition numbers d
λν
for all partitions of the form λ = (a, c, 1
b
) and ν 2 − regular.