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Search: id:A015509
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| A015509 |
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (8^k-1)/7 a(k). |
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| 1, 1, 10, 740, 433640, 2030302480, 76034827876000, 22779578222682344000, 54596862986901017252624000, 1046838176230046602563156976288000, 160576277008444677145920980328106246720000
(list; graph; listen)
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