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A015508
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (7^k-1)/6 a(k).
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0
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1, 1, 9, 522, 209322, 586520244, 11501075464596, 1578614616119517768, 1516734501782248791012168, 10200952598655696033329019125136, 480252779391204632593567857157274897424
(list; graph; refs; listen; history; internal format)
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