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 A132762 a(n) = n*(n + 19). 12
 0, 20, 42, 66, 92, 120, 150, 182, 216, 252, 290, 330, 372, 416, 462, 510, 560, 612, 666, 722, 780, 840, 902, 966, 1032, 1100, 1170, 1242, 1316, 1392, 1470, 1550, 1632, 1716, 1802, 1890, 1980, 2072, 2166, 2262, 2360, 2460, 2562, 2666 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES F. P. Muga II, Extending the Golden Ratio and the Binet-de Moivre Formula, March 2014; Preprint on ResearchGate. LINKS Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 2*n + a(n-1) + 18 for n > 0, a(0) = 0. - Vincenzo Librandi, Aug 03 2010 From Chai Wah Wu, Dec 17 2016: (Start) a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n > 2. G.f.: 2*x*(9*x - 10)/(x - 1)^3. (End) a(n) = 2*A051942(n+9). - R. J. Mathar, Sep 05 2018 MATHEMATICA Table[n (n + 19), {n, 0, 50}] (* Bruno Berselli, Sep 05 2018 *) PROG (PARI) a(n)=n*(n+19) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A002378, A120071. Sequence in context: A041794 A041796 A041798 * A075228 A256102 A128672 Adjacent sequences:  A132759 A132760 A132761 * A132763 A132764 A132765 KEYWORD nonn,easy AUTHOR Omar E. Pol, Aug 28 2007 STATUS approved

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Last modified March 22 10:07 EDT 2019. Contains 321421 sequences. (Running on oeis4.)