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A137157
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G.f.: 1 = Sum_{n>=0} a(n)*x^n/(1+x)^(2*2^n).
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4
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1, 2, 5, 24, 239, 4920, 206727, 17568408, 3003763243, 1030272816360, 707851744149198, 973425618916674288, 2678332881795756783639, 14741522294008025924154864, 162290544340043699103996962253
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