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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,...;
1,256,65280,16613760,4222658560,1072200161920,(272033712041216),...;
1,512,261632,133563136,68139438080,34745409189120,17710292513905152,(9024264001164470016),...;
...
Where the terms in parenthesis form the initial terms of this sequence.
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