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A170747
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G.f.: (1+x)/(1-27*x).
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49
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1, 28, 756, 20412, 551124, 14880348, 401769396, 10847773692, 292889889684, 7908027021468, 213516729579636, 5764951698650172, 155653695863554644, 4202649788315975388, 113471544284531335476, 3063731695682346057852, 82720755783423343562004, 2233460406152430276174108
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