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 A167585 a(n) = 12*n^2 - 8*n + 9. 3
 13, 41, 93, 169, 269, 393, 541, 713, 909, 1129, 1373, 1641, 1933, 2249, 2589, 2953, 3341, 3753, 4189, 4649, 5133, 5641, 6173, 6729, 7309, 7913, 8541, 9193, 9869, 10569, 11293, 12041, 12813, 13609, 14429, 15273, 16141, 17033, 17949, 18889 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The third row of the ED4 array A167584. LINKS G. C. Greubel, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA GF(z) = (9*z^2 + 2*z + 13)/(1-z)^3. a(n) = a(n-1) + 24*n - 20, with a(1)=13. - Vincenzo Librandi, Dec 03 2010 a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). - G. C. Greubel, Jun 17 2016 MATHEMATICA LinearRecurrence[{3, -3, 1}, {13, 41, 93}, 100] (* G. C. Greubel, Jun 17 2016 *) PROG (PARI) a(n)=12*n^2-8*n+9 \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Sequence in context: A139866 A026918 A123972 * A141970 A305155 A355965 Adjacent sequences: A167582 A167583 A167584 * A167586 A167587 A167588 KEYWORD easy,nonn AUTHOR Johannes W. Meijer, Nov 10 2009 STATUS approved

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Last modified November 29 03:03 EST 2023. Contains 367422 sequences. (Running on oeis4.)