It says in the question to evaluete R^m_{n ,} I need to find R^m-1_n+1 and R^m-1_n, which in turn I need to find the "R" values corresponding to "m-2" and so on.., until I reach m=0 and we then backtrack so solve through the "R"'s to get R^m_n..

Can anyone help?

Thanks, but how do I start it off especially the R^m_n  part?

EDIT- Never mind, got it and thanks :)