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 A180232 a(n) = n*(17*n - 13)/2. 3
 0, 2, 21, 57, 110, 180, 267, 371, 492, 630, 785, 957, 1146, 1352, 1575, 1815, 2072, 2346, 2637, 2945, 3270, 3612, 3971, 4347, 4740, 5150, 5577, 6021, 6482, 6960, 7455, 7967, 8496, 9042, 9605, 10185, 10782, 11396, 12027, 12675, 13340, 14022, 14721, 15437, 16170 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = n + A051871(n). a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). G.f.: x*(2+15*x)/(1-x)^3. - R. J. Mathar, Aug 29 2010 E.g.f.: x *(4 + 17*x)*exp(x)/2. - G. C. Greubel, Aug 30 2019 MAPLE seq(n*(17*n-13)/2, n=0..40); # G. C. Greubel, Aug 30 2019 MATHEMATICA Table[(n(17n-13))/2, {n, 0, 50}] (* or *) LinearRecurrence[{3, -3, 1}, {0, 2, 21}, 50] (* Harvey P. Dale, Sep 14 2011 *) PROG (PARI) a(n)=1/2*(17*n^2 - 13*n); (Magma) [n*(17*n-13)/2:n in [0..40]]; // Vincenzo Librandi, Sep 15 2011 (Sage) [n*(17*n-13)/2 for n in (0..40)] # G. C. Greubel, Aug 30 2019 (GAP) List([0..40], n-> n*(17*n-13)/2); # G. C. Greubel, Aug 30 2019 CROSSREFS Cf. A051871. Cf. A226488. [Bruno Berselli, Jun 10 2013] Sequence in context: A231807 A351118 A097718 * A075681 A212257 A034520 Adjacent sequences: A180229 A180230 A180231 * A180233 A180234 A180235 KEYWORD nonn,easy AUTHOR Graziano Aglietti (mg5055(AT)mclink.it), Aug 18 2010 EXTENSIONS More terms from R. J. Mathar, Aug 29 2010 STATUS approved

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Last modified September 12 11:30 EDT 2024. Contains 375850 sequences. (Running on oeis4.)