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 A027599 a(n) = 3n^2 - 7n + 6. 3
 6, 2, 4, 12, 26, 46, 72, 104, 142, 186, 236, 292, 354, 422, 496, 576, 662, 754, 852, 956, 1066, 1182, 1304, 1432, 1566, 1706, 1852, 2004, 2162, 2326, 2496, 2672, 2854, 3042, 3236, 3436, 3642, 3854, 4072, 4296, 4526, 4762, 5004, 5252, 5506 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES Encyclopaedia Britannica, 1965 ed., Vol. 16 pp. 755-756. LINKS Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = a(n-1) + 6*n - 10 (with a(0)=6). - Vincenzo Librandi, Nov 19 2010 a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). G.f.: 2*(3 - 8*x + 8*x^2)/(1 - x)^3. - Colin Barker, May 22 2012 PROG (PARI) a(n)=3*n^2-7*n+6 \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A049450. Sequence in context: A169843 A329591 A123139 * A248272 A058160 A033939 Adjacent sequences:  A027596 A027597 A027598 * A027600 A027601 A027602 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified January 24 20:36 EST 2021. Contains 340411 sequences. (Running on oeis4.)