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Search: id:A085695
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| A085695 |
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a(n) = F(n) F(3n) / 2, where F(n) = Fibonacci number (A000045). |
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+0
1
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| 0, 1, 4, 34, 216, 1525, 10336, 71149, 486864, 3339106, 22881100, 156843721, 1074985344, 7368157369, 50501844796, 346145466850, 2372514562656, 16261461342589, 111457702083424, 763942486626661, 5236139616899400
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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G.f.: ( x - x^3 )/( 1 - 4 x - 19 x^2 - 4 x^3 + x^4 ) Recurrence: a(n+4) = 4 a(n+3) + 19 a(n+2) + 4 a(n+1) - a(n)
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PROGRAM
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(Mupad) numlib::fibonacci(3*n)*numlib::fibonacci(n)/2 $ n = 0..35; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 13 2008
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CROSSREFS
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Sequence in context: A054464 A002101 A129557 this_sequence A049293 A116430 A155628
Adjacent sequences: A085692 A085693 A085694 this_sequence A085696 A085697 A085698
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KEYWORD
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easy,nonn
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AUTHOR
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Emanuele Munarini (munarini(AT)mate.polimi.it), Jul 18 2003
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