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A051039
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4-Stohr sequence.
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9
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1, 2, 4, 8, 16, 31, 46, 61, 76, 91, 106, 121, 136, 151, 166, 181, 196, 211, 226, 241, 256, 271, 286, 301, 316, 331, 346, 361, 376, 391, 406, 421, 436, 451, 466, 481, 496, 511, 526, 541, 556, 571, 586, 601, 616, 631, 646, 661, 676, 691, 706, 721, 736, 751
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = 15*n-59 for n>4. a(n) = 2*a(n-1)-a(n-2) for n>6. G.f.: x*(7*x^5+4*x^4+2*x^3+x^2+1)/(x-1)^2. [Colin Barker, Sep 19 2012]
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MATHEMATICA
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LinearRecurrence[{2, -1}, {1, 2, 4, 8, 16, 31}, 60] (* Harvey P. Dale, Dec 25 2016 *)
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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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STATUS
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approved
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