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A136559
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G.f.: A(x) = Sum_{n>=0} atanh( 2^(2n+1)*x )^(2n+1) / (2n+1)! ; a power series in x with integer coefficients.
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2
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2, 0, 88, 0, 285088, 0, 112173964160, 0, 6667221644498203136, 0, 66605167708510907980664608768, 0, 120169056821375322042225614651624227643392, 0
(list; graph; refs; listen; history; internal format)
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