sum of the even coefficents formula
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cofficents of x/coffiecents of x2
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If you take very small values of nn, say n=5n=5, n=6n=6,n=7n=7, dont you find very simple values ? Try after that to look for a general "closed form" (very simple!) formula ∑q=0Cn2q∑q=0C2qn
78910:
but not helpful much
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