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A189744
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a(1)=4, a(2)=5, a(n) = 4*a(n-1) + 5*a(n-2).
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13
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4, 5, 40, 185, 940, 4685, 23440, 117185, 585940, 2929685, 14648440, 73242185, 366210940, 1831054685, 9155273440, 45776367185, 228881835940, 1144409179685, 5722045898440, 28610229492185, 143051147460940, 715255737304685, 3576278686523440, 17881393432617185
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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LinearRecurrence[{4, 5}, {4, 5}, 40]
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PROG
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(Maxima) a[1]:4$ a[2]:5$ a[n]:=4*a[n-1]+5*a[n-2]$ makelist(a[n], n, 1, 24); /* Bruno Berselli, May 24 2011 */
(Magma) [5/2*(-1)^(n-1)+3/2*5^(n-1): n in [1..30]]; // Vincenzo Librandi, Jul 15 2011
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CROSSREFS
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Cf. A000045, A000079, A105476, A159612, A080040, A135522, A103435, A189732, A189734-A189739, A189741, A189742, A189743, A189745-A189749.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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