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Search: id:A015502
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| A015502 |
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (3^k-1)/2 a(k). |
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| 1, 1, 5, 70, 2870, 350140, 127801100, 139814403400, 458731057555400, 4514831068460246800, 133300387296288786770000, 11806948504381482999365980000, 3137354163532752044074527571580000
(list; graph; listen)
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