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Search: id:A015486
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| A015486 |
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a(0)=1, a(1)=2, a(n) = sum_{k=0}^{k=n-1} 2^k a(k). |
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| 1, 2, 5, 25, 225, 3825, 126225, 8204625, 1058396625, 272007932625, 139540069436625, 143028571172540625, 293065542332535740625, 1200689526936398929340625, 9837249294189916428087740625
(list; graph; listen)
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