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A010974
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Binomial coefficient C(n,21).
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2
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1, 22, 253, 2024, 12650, 65780, 296010, 1184040, 4292145, 14307150, 44352165, 129024480, 354817320, 927983760, 2319959400, 5567902560, 12875774670, 28781143380, 62359143990, 131282408400, 269128937220
(list; graph; refs; listen; history; internal format)
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OFFSET
| 21,2
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COMMENTS
| In this sequence there are no primes - Artur Jasinski (grafix(AT)csl.pl), Dec 02 2007
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LINKS
| Milan Janjic, Two Enumerative Functions
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FORMULA
| a(n)=n(n+1)(n+2)(n+3)(n+4)(n+5)(n+6)(n+7)(n+8)(n+9)(n+10)(n+11)(n+12)(n+13)(n+14)(n+15)(n+16)(n+17)(n+18)(n+19)(n+20)/21! - Artur Jasinski (grafix(AT)csl.pl), Dec 02 2007
a(n) = n/(n-21) * a(n-1), n>21. - Vincenzo Librandi, Mar 26 2011
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MAPLE
| (Maple) seq(binomial(n, 21), n=21..41); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 04 2008]
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MATHEMATICA
| Table[Binomial[n, 21], {n, 21, 50}] (* From Vladimir Joseph Stephan Orlovsky, Apr 22 2011 *)
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PROG
| (MAGMA) [ Binomial(n, 21): n in [21..80]]; - Vincenzo Librandi, Mar 26 2011
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CROSSREFS
| Pascal's triangle A007318 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 04 2008]
Sequence in context: A162364 A028571 A162679 * A022587 A143479 A004412
Adjacent sequences: A010971 A010972 A010973 * A010975 A010976 A010977
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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