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Search: id:A015506
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| A015506 |
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (5^k-1)/4 a(k). |
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1
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| 1, 1, 7, 224, 35168, 27501376, 107447876032, 2098671914657024, 204950003169660992768, 100073397447688408870744576, 244319893042568615235897903058432
(list; graph; listen)
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