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A082405
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a(n) = 34*a(n-1) - a(n-2); a(0)=0, a(1)=6.
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5
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0, 6, 204, 6930, 235416, 7997214, 271669860, 9228778026, 313506783024, 10650001844790, 361786555939836, 12290092900109634, 417501372047787720, 14182756556724672846, 481796221556591089044, 16366888776367372354650
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OFFSET
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0,2
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COMMENTS
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Sequence refers to inradius of primitive Pythagorean triangle with consecutive legs, even followed by odd. It has semiperimeter A046176(n+1) and area a(n)*A046176(n+1).
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LINKS
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FORMULA
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MATHEMATICA
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a[0] = 1; a[1] = 6; a[n_] := 34 a[n-1] - a[n-2]; Table[a[n], {n, 0, 15}] (* or *) LinearRecurrence[{34, -1}, {1, 6}, 16] (* Indranil Ghosh, Feb 18 2017 *)
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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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