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 A177065 a(n) = (8*n+3)*(8*n+5). 2
 15, 143, 399, 783, 1295, 1935, 2703, 3599, 4623, 5775, 7055, 8463, 9999, 11663, 13455, 15375, 17423, 19599, 21903, 24335, 26895, 29583, 32399, 35343, 38415, 41615, 44943, 48399, 51983, 55695, 59535, 63503, 67599, 71823, 76175, 80655 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Cf. comment of Reinhard Zumkeller in A177059: in general, (h*n+h-k)*(h*n+k) = h^2*A002061(n+1)+(h-k)*k-h^2; therefore a(n) = 64*A002061(n+1)-49. - Bruno Berselli, Aug 24 2010 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 128*n+a(n-1) with n>0, a(0)=15. a(n) = A125169(A016754(n) - 1). - Reinhard Zumkeller, Jul 05 2010 a(0)=15, a(1)=143, a(2)=399, a(n)=3*a(n-1)-3*a(n-2)+a(n-3). - Harvey P. Dale, Mar 13 2013 G.f.: (15+98*x+15*x^2)/(1-x)^3. - Vincenzo Librandi, Apr 08 2013 MAPLE A177065:=n->(8*n+3)*(8*n+5): seq(A177065(n), n=0..100); # Wesley Ivan Hurt, Apr 24 2017 MATHEMATICA Table[(8n+3)(8n+5), {n, 0, 40}] (* or *) LinearRecurrence[{3, -3, 1}, {15, 143, 399}, 40] (* Harvey P. Dale, Mar 13 2013 *) CoefficientList[Series[(15 + 98 x + 15 x^2)/(1-x)^3, {x, 0, 50}], x] (* Vincenzo Librandi, Apr 08 2013 *) PROG (MAGMA) [(8*n+3)*(8*n+5): n in [0..50]]; // Vincenzo Librandi, Apr 08 2013 (PARI) a(n)=(8*n+3)*(8*n+5) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A002061, A016754, A125169, A177059. Sequence in context: A279921 A179524 A235864 * A173406 A291619 A071700 Adjacent sequences:  A177062 A177063 A177064 * A177066 A177067 A177068 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, May 31 2010 EXTENSIONS Edited by N. J. A. Sloane, Jun 22 2010 STATUS approved

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Last modified August 4 13:24 EDT 2020. Contains 336201 sequences. (Running on oeis4.)