substitution for all indexes



Hi

I started to use maxima and

I have a multi-serie including terms like   a[n,k_n+1,k_n]   (k_i are 
the integers on which the summations are done)

a  follows a recursive law:

a[n,k_n+1,k_n] = a[n-1,k_n+1,k_n] - a[n-1,k_n+1,k_n-1] * 
a[n-1,k_n,k_n-1] / a[n-1,k_n-1,k_n-1]


I would like to apply this law for a given n, but for all the index k_i, 
in one single command

i.e. for example to replace a[5,k5,k4],  a[5,k4,k3], a[5,k3,k2] etc  by 
the  a[4,?,?] in one step

is this possible with maxima?



Merci


St?phan