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A147974
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a(n) = n^3-((n-1)^3+(n-2)^3+(n-3)^3).
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1
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10, 8, 18, 28, 26, 0, -62, -172, -342, -584, -910, -1332, -1862, -2512, -3294, -4220, -5302, -6552, -7982, -9604, -11430, -13472, -15742, -18252, -21014, -24040, -27342, -30932, -34822, -39024, -43550, -48412, -53622, -59192, -65134, -71460
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f.: -2*x*(18*x^3-23*x^2+16*x-5)/(x-1)^4. [Colin Barker, Oct 29 2012]
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MATHEMATICA
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lst={}; Do[k=n^3-((n-1)^3+(n-2)^3+(n-3)^3); AppendTo[lst, k], {n, 5!}]; lst
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PROG
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(Python)
def a(n): return n**3-((n-1)**3+(n-2)**3+(n-3)**3)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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