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A123115
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Sequence allows us to find Y values of the equation: (X-Y)^4-2XY=0 with X>=Y.
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0
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0, 2, 96, 3430, 117504, 3997418, 135828000, 4614348622, 156753156096, 5324999550290, 180893269972704, 6145046403443638, 208750685752224000, 7091378276778928442, 240898110769066766496, 8183444388129896917150
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sequence gives Y values. To find X values: a(n)=c(n)*(1+d(n))which gives: 0,4,108,3500,117912,3999796,135841860,4614429404,...
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FORMULA
| b(n)=c(n)*(-1+d(n)) with c(0)=0,c(1)=1 and c(n)=6*c(n-1)-c(n-2) d(0)=1,d(1)=3 and d(n)=6*d(n-1)-d(n-2)
For n>=4, a(n) = 40*a(n-1) - 206*a(n-2) + 40*a(n-3) - a(n-4) [From Max Alekseyev (maxale(AT)gmail.com), Nov 13 2009]
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CROSSREFS
| Cf. A123056.
Sequence in context: A158980 A069121 A157065 * A119696 A064069 A065128
Adjacent sequences: A123112 A123113 A123114 * A123116 A123117 A123118
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KEYWORD
| nonn
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AUTHOR
| Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Sep 28 2006
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EXTENSIONS
| More terms from Max Alekseyev (maxale(AT)gmail.com), Nov 13 2009
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