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A129326
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a(n) = (2*n+1)*(n-1)!.
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9
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3, 5, 14, 54, 264, 1560, 10800, 85680, 766080, 7620480, 83462400, 997920000, 12933043200, 180583603200, 2702527027200, 43153254144000, 732297646080000, 13160434839552000, 249692574523392000, 4987449116762112000, 104614786351595520000, 2299092397726924800000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)=A052649(n), n>=1 (i.e., A052649 with a(0) omitted).
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..100
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FORMULA
| a(n)=A052649(n), n>=1. - R. J. Mathar, Jun 14 2008
a(n)=(n+1)!*h(n+1)-n*(n+1)*(n-1)!*h(n-1), where h(n)=sum(1/k,k=1..n). [From Gary Detlefs, Jul 19 2011]
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PROG
| (MAGMA) [(2*n+1)*Factorial(n-1): n in [1..25]]; // Vincenzo Librandi, Aug 07 2011
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CROSSREFS
| Sequence in context: A006395 A078718 A081393 * A167553 A118562 A115043
Adjacent sequences: A129323 A129324 A129325 * A129327 A129328 A129329
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KEYWORD
| nonn,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), May 26 2007
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EXTENSIONS
| More terms from N. J. A. Sloane (njas(AT)research.att.com), Nov 08 2007
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