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2, 10, 70, 462, 3018, 19922, 133262, 901654, 6155410, 42306714, 292240854, 2026154846, 14085427802, 98109713506, 684326588446, 4778079088038, 33385518460194, 233393453440298, 1632228295176038, 11417968671701230
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: 2*(1-9*x+25*x^2-41*x^3)/((1-x)^2*(1-5*x)*(1-7*x)). - Vincenzo Librandi, Feb 25 2013
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MATHEMATICA
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CoefficientList[Series[2 (1 - 9 x + 25 x^2 - 41 x^3)/((1-x)^2 (1-5 x)(1-7 x)), {x, 0, 30}], x] (* Vincenzo Librandi, Feb 25 2013 *)
LinearRecurrence[{14, -60, 82, -35}, {2, 10, 70, 462}, 30] (* Harvey P. Dale, Dec 21 2014 *)
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PROG
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(Magma) [7^n+5^n-2*n: n in [0..20]] /* or */ I:=[2, 10, 70, 462]; [n le 4 select I[n] else 14*Self(n-1)-60*Self(n-2)+82*Self(n-3)-35*Self(n-4): n in [1..20]]; // Vincenzo Librandi, Feb 25 2013
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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