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A014930
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a(1)=1, a(n)=n*15^(n-1)+a(n-1).
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1
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1, 31, 706, 14206, 267331, 4823581, 84557956, 1451432956, 24517448581, 408951042331, 6752105339206, 110549175651706, 1797251568229831, 29043982525261081, 466937872906120456, 7473240118999870456
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