OK, I think I see where I am confused; I have been assuming y(n)=0 for n<0 in which case y(0) and y(1) are uniquely determined from the particular solution but Maple isn't assuming y(n) = 0 for n<0.

Thanks for all the help

Thanks Robert, I this convinced me to upgrade to Maple 14.

Thanks!  This is exactly what I was looking for!  Your help is much appreciated!

Thanks to all for the help

Thanks