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A103968
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Sigma((8^n - 1)/7), where sigma(n) is the sum of positive divisors of n.
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0
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1, 13, 74, 1092, 4864, 59200, 346112, 4756752, 19436692, 251916288, 1294876800, 20786304000, 79541043200, 1073030266880, 5303003316224, 81061789640832, 324992122224640, 4102172934143680, 20588576135708672, 376372958524932096
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