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A020724
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G.f.: 1/((1-6*x)*(1-9*x)*(1-12*x)).
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0
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1, 27, 495, 7695, 109431, 1474767, 19198215, 244167615, 3055792311, 37811613807, 464078786535, 5662363023135, 68791291322391, 833094971965647, 10065613312624455, 121404092777808255, 1462402531680439671
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (12^(n+2) - 2*9^(n+2) + 6^(n+2))/18. - Yahia Kahloune, Jun 30 2013
a(n) = 27*a(n-1) - 234*a(n-2) + 648*a(n-3). - Jinyuan Wang, Mar 10 2020
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PROG
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(PARI) Vec(1/((1-6*x)*(1-9*x)*(1-12*x)) + O(x^30)) \\ Jinyuan Wang, Mar 10 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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