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A086117
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Denominator of mean deviation of a symmetrical binomial distribution on n elements.
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4
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2, 2, 4, 4, 16, 16, 32, 32, 256, 256, 512, 512, 2048, 2048, 4096, 4096, 65536, 65536, 131072, 131072, 524288, 524288, 1048576, 1048576, 8388608, 8388608, 16777216, 16777216, 67108864, 67108864, 134217728, 134217728, 4294967296, 4294967296
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also denominator of x(n)=Sum(x(k)*x(n-k-1):0<=k<n), x(0)=1/2: x(n)=A098597(n)/a(n+2). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 06 2008
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LINKS
| Eric Weisstein's World of Mathematics, Binomial Distribution
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FORMULA
| a(1)=2, a(n)=a(n-1)*A006519(n) - Jon Perry (perry(AT)globalnet.co.uk), Mar 31 2004
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MATHEMATICA
| Denominator[Table[If[OddQ[n], n!!/2/(n-1)!!, (n-1)!!/2/(n-2)!! ], {n, 50}]]
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CROSSREFS
| Cf. A086116.
Twice A101926.
Sequence in context: A106051 A066781 A112869 * A095240 A110428 A076928
Adjacent sequences: A086114 A086115 A086116 * A086118 A086119 A086120
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KEYWORD
| nonn,frac
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Jul 10, 2003
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