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Search: id:A052203
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| A052203 |
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a(n)=(4n+1)*binomial(4n,n)/(3n+1). |
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+0
6
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| 1, 5, 36, 286, 2380, 20349, 177100, 1560780, 13884156, 124403620, 1121099408, 10150595910, 92263734836, 841392966470, 7694644696200, 70539987842520, 648045936942300, 5964720367660956, 54991682779774384, 507749884105448600
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Central terms of the triangle in A122366. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Aug 30 2006
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FORMULA
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a(n)=C(4n+1, n); a(n) is asymptotic to c/sqrt(n)*(256/27)^n with c=0.614... - Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 27 2003
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CROSSREFS
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Cf. A002293 and A051944.
Sequence in context: A067376 A098305 A055270 this_sequence A027331 A091161 A135149
Adjacent sequences: A052200 A052201 A052202 this_sequence A052204 A052205 A052206
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KEYWORD
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easy,nonn
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AUTHOR
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Barry E. Williams, Jan 28 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jan 31 2000
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