This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A168411 #22 Mar 04 2024 01:12:44
%S A168411 7,7,16,16,25,25,34,34,43,43,52,52,61,61,70,70,79,79,88,88,97,97,106,
%T A168411 106,115,115,124,124,133,133,142,142,151,151,160,160,169,169,178,178,
%U A168411 187,187,196,196,205,205,214,214,223,223,232,232,241,241,250,250,259
%N A168411 a(n) = 7 + 9*floor((n-1)/2).
%H A168411 Vincenzo Librandi, <a href="/A168411/b168411.txt">Table of n, a(n) for n = 1..1000</a>
%H A168411 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1,1,-1).
%F A168411 a(n) = 9*n - a(n-1) - 4, with n>1, a(1)=7.
%F A168411 G.f.: x*(7 + 2*x^2) / ( (1+x)*(x-1)^2 ). - _R. J. Mathar_, Jul 10 2011
%F A168411 a(n) = a(n-1) +a(n-2) -a(n-3). - _Vincenzo Librandi_, Sep 19 2013
%F A168411 E.g.f.: (1/4)*(-9 + 8*exp(x) + (18*x + 1)*exp(2*x))*exp(-x). - _G. C. Greubel_, Jul 22 2016
%t A168411 Table[7 + 9 Floor[(n - 1)/2], {n, 70}] (* or *) CoefficientList[Series[(7 + 2 x^2)/((1 + x) (x - 1)^2), {x, 0, 70}], x] (* _Vincenzo Librandi_, Sep 19 2013 *)
%o A168411 (Magma) [7+9*Floor((n-1)/2): n in [1..70]]; // _Vincenzo Librandi_, Sep 19 2013
%Y A168411 Cf. A017245.
%K A168411 nonn,easy
%O A168411 1,1
%A A168411 _Vincenzo Librandi_, Nov 25 2009
%E A168411 New definition by _Vincenzo Librandi_, Sep 19 2013