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EXAMPLE
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Table of coefficients in the (2^i)-th iteration of x+x^2 begins:
(1),1;
1,(2),2,1;
1,4,(12),30,64,118,188,258,302,298,244,162,84,32,8,1;
1,8,56,(364),2240,13188,74760,409836,2179556,11271436,56788112,...;
1,16,240,3480,(49280),685160,9383248,126855288,1695695976,...;
1,32,992,30256,912640,(27297360),810903456,23950328688,...;
1,64,4032,252000,15665664,969917088,(59855127360),3683654668512,...;
1,128,16256,2056384,259445760,32668147008,4106848523904,(515600292989376),...;
1,256,65280,16613760,4222658560,1072200161920,272033712041216,68973668731925376,(17478262497392546432),...;
...
where the terms in parenthesis form the initial terms of this sequence.
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