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0, 100, 2250, 30000, 312500, 2812500, 22968750, 175000000, 1265625000, 8789062500, 59082031250, 386718750000, 2475585937500, 15551757812500, 96130371093750, 585937500000000, 3527832031250000, 21011352539062500
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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FORMULA
| 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) [From Harvey P. Dale, Oct 25 2011]
G.f.: (50*(5*x^2+2*x))/(5*x-1)^4 [From Harvey P. Dale, Oct 25 2011]
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MATHEMATICA
| 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
| (MAGMA) [(n^3-n^2)*5^n: n in [1..30]]; // Vincenzo Librandi, Oct 26 2011
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CROSSREFS
| Cf. A128796; A036289.
Sequence in context: A167043 A203283 A114777 * A075822 A200937 A112889
Adjacent sequences: A128985 A128986 A128987 * A128989 A128990 A128991
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KEYWORD
| nonn
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AUTHOR
| Mohammad K. Azarian (azarian(AT)evansville.edu), Apr 30 2007
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EXTENSIONS
| Corrected the first offset. - Mohammad K. Azarian (azarian(AT)evansville.edu), Nov 19 2008
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