Al. a. Tchouproff 
151 
we find 
Wr+i, IN} = J^r 1 
/=i 
li=0 
2 .Y , 
+ G,!' mr+,-i. {N - IV' uv-i) + (i^^ - !)'■ w'l (.V- 
Substituting hero (see (4)) 
.'/=1 
we find : 
iV ( 7( = i i=i 
On the other hand 
1 
Hence 
(3) Putting (see Introduction (2)) 
ivt-^-i = '2 (-iy/8;,ri\^^--^, 
we find from (4) 
-tV 7, = () 
When r = 2,3,4 we find : 
..(8). 
3 1 
«i3, (.V) = + '«! ^2 + ]V2 
.(9). 
.(10). 
..(11). 
