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Search: id:A061485
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| A061485 |
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Numerator of 1/(2n-1) + 3/(2n-3) + 5/(2n-5) + ...(2n-1)/1. |
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+0
1
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| 1, 10, 31, 988, 811, 19102, 131093, 1096792, 2420773, 95052434, 48911887, 4616289884, 5904218077, 36168951362, 534488973899, 269764710179504, 17133785963669, 34783298901958, 652516251742073, 2644314567590492
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(1) =1, a(2) =10 as (1/3 + 3/1) = 10/3, a(3) =31 as 1/5 + 3/3 + 5/1 =31/5
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PROGRAM
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/* REXX */ numeric digits 100; do N = 1 to 22; X = 1; do K = 1 to N; X = X*(2*K-1); end K; Y = 0; do K = 1 to N; Y = Y +(2*K-1)*X/(2*N-(2*K-1)); end K; say Y / GCD(X, Y); end; N
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CROSSREFS
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Sequence in context: A161325 A042849 A097236 this_sequence A136335 A008422 A063926
Adjacent sequences: A061482 A061483 A061484 this_sequence A061486 A061487 A061488
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KEYWORD
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nonn,frac,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 06 2001
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EXTENSIONS
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Corrected and extended by Frank.Ellermann(AT)t-online.de
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