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A015507
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (6^k-1)/5 a(k).
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0
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1, 1, 8, 352, 91520, 142405120, 1328924579840, 74403829376081920, 24994031979330942894080, 50376471215620688640734003200, 609214555257707874214915513922355200
(list; graph; refs; listen; history; internal format)
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