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A298881
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a(0) = 0; for n>0, a(n) = 6*n!.
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2
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0, 6, 12, 36, 144, 720, 4320, 30240, 241920, 2177280, 21772800, 239500800, 2874009600, 37362124800, 523069747200, 7846046208000, 125536739328000, 2134124568576000, 38414242234368000, 729870602452992000, 14597412049059840000, 306545653030256640000
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OFFSET
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0,2
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LINKS
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FORMULA
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E.g.f.: 6*x/(1-x).
a(n) = n*a(n-1) = 6*A000142(n) for n>0.
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MATHEMATICA
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Join[{0}, 6 Range[25]!]
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PROG
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(Magma) [n eq 0 select 0 else 6*Factorial(n): n in [0..25]];
(GAP) Concatenation([0], List([1..25], n -> 6*Factorial(n))); # Bruno Berselli, Feb 13 2018
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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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EXTENSIONS
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STATUS
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approved
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