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Search: id:A110348
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| 1, 1, 8, 45, 504, 5040, 86400, 1247400, 28828800, 544864320, 15850598400, 370507737600, 12996271411200, 362038989312000, 14867734494412800, 480878287553664000, 22629566473113600000, 833522365093017600000
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OFFSET
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1,3
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FORMULA
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a(2n+1) = (n+1)(n+2)...(2n-1)(2n)(2n+2) ...(3n+1)(3n+2). a(2n) = (1/2)(n+1)(n+2)...(2n-2)(2n-1)(2n+1)(2n+2)...(3n-1)(3n).
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EXAMPLE
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a(3) = 2*3*4/3 = 8, a(6)= 3*4*5*7*8*9/6 = 5040.
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CROSSREFS
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Cf. A110347.
Sequence in context: A009369 A120044 A002686 this_sequence A137390 A034469 A134114
Adjacent sequences: A110345 A110346 A110347 this_sequence A110349 A110350 A110351
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 21 2005
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EXTENSIONS
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More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 08 2006
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