In case any one is interested:-

Using

A/(1-dz^-1)^m <--z--> [A(n-1)...(n+m-1)d^n/(m-1)!]u[n] for ROC |z|>d

which implies the answer is:

y[n]= 1/2(n+2)(n+1)u[n]

Can also be solved using the power series but harder to find a general representation..