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Search: id:A072343
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| A072343 |
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a(n) = 2^(n-1)*sum(k=0,n,(n+k)!/k!^2). |
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| 3, 28, 320, 4272, 65632, 1149312, 22712832, 501216000, 12225264128, 326574262272, 9478749110272, 296914161754112, 9979741990993920, 358151267772203008, 13664955628675399680, 552220995731872481280
(list; graph; listen)
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