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A173218
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G.f.: A(x) = Sum_{n>=0} (1 + x)^(n^2+n) / 2^(n+1).
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2
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1, 4, 50, 1040, 30300, 1135080, 51972668, 2812429632, 175606496520, 12426817517920, 982846762742416, 85916923493646752, 8225856593959648696, 856044724445883011520, 96213518828394481754400
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