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Search: id:A137788
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| A137788 |
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a(n) = 6^n-5^n-4^n-3^n-2^n. |
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+0
1
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| -8, -18, -8, 318, 3352, 26142, 183112, 1216638, 7842232, 49591902, 309595432, 1915328958, 11771279512, 71987413662, 438579282952, 2664183937278, 16146410851192, 97676152243422, 590010212989672, 3559688008961598, 21455704973213272, 129219894479953182, 777738831202779592
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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G.f.: 2*x*(4-71*x+444*x^2-1164*x^3+1080*x^4)/((6*x-1)*(4*x-1)*(3*x-1)*(2*x-1)*(5*x-1)). a(n)= 20*a(n-1)-155*a(n-2)+580*a(n-3)-1044*a(n-4)+720*a(n-5) . [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 15 2009]
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MAPLE
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a:=proc (n) options operator, arrow: 6^n-5^n-4^n-3^n-2^n end proc: seq(a(n), n =1..20); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 25 2008
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MATHEMATICA
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Array[6^#-5^#-4^#-3^#-2^# &, 10, 0]
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CROSSREFS
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Sequence in context: A107779 A018874 A163900 this_sequence A133202 A101241 A031258
Adjacent sequences: A137785 A137786 A137787 this_sequence A137789 A137790 A137791
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KEYWORD
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sign
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 28 2008
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EXTENSIONS
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More terms from Alexander Povolotsky and Emeric Deutsch (deutsch(AT)duke.poly.edu), May 01 2008
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