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RSolve question


To the List:

I appreciate if you can give me some input into the following math
questions that puzzle me quite a bit:

1) Why am I getting the following error?  This example came from
Wolfram Koepf's PowerSeries`.  You don't need this package here.

In[2]:=
RSolve[{
k*(1 + k)*a[k] + (1 + k)*(2 + k)*a[2 + k] == 0,
a[0]==0, a[1]==1}, a[k], k]

DSolve::dnim:
   Built-in procedures cannot solve this differential
     equation.
DSolve::dnim:
   Built-in procedures cannot solve this differential
     equation.
Out[2]=
RSolve[{k (1 + k) a[k] + (1 + k) (2 + k) a[2 + k] == 0,
   a[0] == 0, a[1] == 1}, a[k], k]

TX in advance

Daitaro Hagihara




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