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A051572
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a(1) = 5, a(n) = sigma(a(n-1)).
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1
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5, 6, 12, 28, 56, 120, 360, 1170, 3276, 10192, 24738, 61440, 196584, 491520, 1572840, 5433480, 20180160, 94859856, 355532800, 1040179456, 2143289344, 4966055344, 10092086208, 31800637440, 137371852800, 641012414823
(list; graph; refs; listen; history; internal format)
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