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A086456
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Expansion of (1+x+sqrt(1-6x+x^2))/2 in powers of x.
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4
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1, -1, -2, -6, -22, -90, -394, -1806, -8558, -41586, -206098, -1037718, -5293446, -27297738, -142078746, -745387038, -3937603038, -20927156706, -111818026018, -600318853926, -3236724317174, -17518619320890, -95149655201962
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