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Search: id:A001449
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| A001449 |
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Binomial coefficients binomial(5n,n). |
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+0
2
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| 1, 5, 45, 455, 4845, 53130, 593775, 6724520, 76904685, 886163135, 10272278170, 119653565850, 1399358844975, 16421073515280, 193253756909160, 2280012686716080, 26958221130508525
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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FORMULA
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(5*n)!/((4*n)!*(n)!).
a(n) is asymptotic to c/sqrt(n)*(3125/256)^n with c=sqrt(5/8/Pi)=0.44603102903819277863474159... - Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 23 2008
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MAPLE
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f := n->(5*n)!/((4*n)!*(n)!);
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MATHEMATICA
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Table[ Binomial[5n, n], {n, 0, 18} ]
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CROSSREFS
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Sequence in context: A054318 A093140 A137233 this_sequence A130976 A151831 A133305
Adjacent sequences: A001446 A001447 A001448 this_sequence A001450 A001451 A001452
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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