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A061580
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a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) by four times its value.
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0
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1, 4, 16, 424, 16816, 42432424, 1681612816816, 42432424483242432424, 16816128168161616321281681612816816, 42432424483242432424424424128483242432424483242432424
(list; graph; refs; listen; history; internal format)
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