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Search: id:A151817
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| 2, 4, 24, 240, 3360, 60480, 1330560, 34594560, 1037836800, 35286451200, 1340885145600
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OFFSET
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0,1
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FORMULA
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(Possible closed form for all terms given) a(n) = 2^(2*n-1)* Pochhammer[1/2, -1 + n] = 2^(2*n-1)*(Gamma(1/2+n-1))/(Gamma(1/2)) = 2^(2*n-1)*(Gamma(n-1/2))/sqrt(pi) (Possible recurrence relation: for all terms given) a(n+1) = 2*(2*n-1)*a(n) [From Alexander R. Povolotsky (pevnev(AT)juno.com), Jul 06 2009]
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CROSSREFS
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Cf.: A052718. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 06 2009]
Sequence in context: A032107 A141307 A038049 this_sequence A038058 A062531 A141599
Adjacent sequences: A151814 A151815 A151816 this_sequence A151818 A151819 A151820
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KEYWORD
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nonn,more
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 31 2009
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EXTENSIONS
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Typo in definition corrected by N. J. A. Sloane, Jul 12 2009
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