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A126964
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a(n) = 2*n*(6*n-1).
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2
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0, 10, 44, 102, 184, 290, 420, 574, 752, 954, 1180, 1430, 1704, 2002, 2324, 2670, 3040, 3434, 3852, 4294, 4760, 5250, 5764, 6302, 6864, 7450, 8060, 8694, 9352, 10034, 10740, 11470, 12224, 13002, 13804, 14630, 15480, 16354, 17252, 18174, 19120, 20090, 21084
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OFFSET
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0,2
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REFERENCES
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V. van der Noort and N. J. A. Sloane, Paper in preparation, 2007.
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LINKS
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FORMULA
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a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n > 2, a(0)=0, a(1)=10, a(2)=44.
G.f.: (10*x + 14*x^2)/(1 - x)^3. (End)
Sum_{n>=1} 1/a(n) = (4*log(2) + 3*log(3) - sqrt(3)*Pi)/4 = 0.15675687388...
E.g.f.: 2*x*(5 + 6*x)*exp(x). (End)
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MAPLE
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MATHEMATICA
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Table[2n(6n-1), {n, 0, 50}] (* or *) LinearRecurrence[{3, -3, 1}, {0, 10, 44}, 50] (* Harvey P. Dale, Nov 19 2011 *)
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PROG
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(Sage) [2*binomial(6*n, 2)/3 for n in (0..50)] # G. C. Greubel, Jan 29 2020
(GAP) List([0..50], n-> 2*Binomial(6*n, 2)/3 ); # G. C. Greubel, Jan 29 2020
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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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STATUS
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approved
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