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EXAMPLE
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G.f.: A(x)=1+x*B(x)^2, B(x)=1+x*C(x)^4, C(x)=1+x*D(x)^6, D(x)=1+x*E(x)^8, ...
where A(x),B(x),C(x),... are the g.f. of the sequences given below.
A=[1,1,2,9,68,732,10250,176654,3613044,85476720,...];
B=[1,1,4,30,328,4677,81888,1696086,40520620,1096342026,...];
C=[1,1,6,63,908,16311,347466,8519957,235763712,7259384208,...];
D=[1,1,8,108,1936,42110,1062416,30283824,958845640,...];
E=[1,1,10,165,3540,90550,2646522,86251140,3086189660,...];
F=[1,1,12,234,5848,172107,5725392,210342902,8410505748,...]; ...
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