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Search: id:A123393
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| A123393 |
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Sequence allows us to find X values of the equation: 7(X-Y)^4-2XY=0 with X>=Y. |
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+0
2
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| 0, 32, 27000, 24193888, 21724523760, 19508551374752, 17518656008529000, 15731733545110199008, 14127079203594427607520, 12686101393056537201642272, 11392104923884436660778375000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Sequence gives X values. To find Y values: b(n)=c(n)*(-1+d(n))which gives: 0,28,26880,24190292,21724416000,...
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FORMULA
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a(n)=c(n)*(1+d(n)) with c(0)=0,c(1)=2 and c(n)=30*c(n-1)-c(n-2) d(0)=1,d(1)=15 and d(n)=30*d(n-1)-d(n-2)
Contribution from Max Alekseyev (maxale(AT)gmail.com), Nov 13 2009: (Start)
For n>=4, a(n) = 928*a(n-1) - 26942*a(n-2) + 928*a(n-3) - a(n-4)
o.g.f.: 8*x*(4*x^2-337*x+4)/(x^2-30*x+1)/(x^2-898*x+1) (End)
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CROSSREFS
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Sequence in context: A091201 A121913 A016877 this_sequence A016937 A074800 A159396
Adjacent sequences: A123390 A123391 A123392 this_sequence A123394 A123395 A123396
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KEYWORD
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nonn
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AUTHOR
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Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Oct 14 2006
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EXTENSIONS
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More terms from Max Alekseyev (maxale(AT)gmail.com), Nov 13 2009
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