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A128988
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a(n) = (n^3 - n^2)*5^n.
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2
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0, 100, 2250, 30000, 312500, 2812500, 22968750, 175000000, 1265625000, 8789062500, 59082031250, 386718750000, 2475585937500, 15551757812500, 96130371093750, 585937500000000, 3527832031250000, 21011352539062500
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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(1)=0, a(2)=100, a(3)=2250, a(4)=30000, a(n)=20*a(n-1)- 150*a(n-2)+ 500*a(n-3)- 625*a(n-4). - Harvey P. Dale, Oct 25 2011
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MATHEMATICA
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Table[(n^3-n^2)5^n, {n, 20}] (* or *) LinearRecurrence[{20, -150, 500, -625}, {0, 100, 2250, 30000}, 20]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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