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 A168328 #27 Sep 08 2022 08:45:49
%S A168328 0,6,6,12,12,18,18,24,24,30,30,36,36,42,42,48,48,54,54,60,60,66,66,72,
%T A168328 72,78,78,84,84,90,90,96,96,102,102,108,108,114,114,120,120,126,126,
%U A168328 132,132,138,138,144,144,150,150,156,156,162,162,168,168,174,174,180,180
%N A168328 a(n) = 6 * floor( n/2 ).
%H A168328 Vincenzo Librandi, <a href="/A168328/b168328.txt">Table of n, a(n) for n = 1..1000</a>
%H A168328 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1,1,-1)
%F A168328 a(n) = 6*n - a(n-1) - 6 for n>1, a(1)=0.
%F A168328 G.f.: 6*x^2/((1+x)*(1-x)^2). - _Bruno Berselli_, Sep 17 2013
%F A168328 a(n) = 6*A004526(n). _Bruno Berselli_, Sep 17 2013
%F A168328 E.g.f.: 3*(x*cosh(x) + (x - 1)*sinh(x)). - _G. C. Greubel_, Jul 18 2016
%t A168328 Table[6 Floor[n/2], {n, 70}] (* _Bruno Berselli_, Sep 18 2013 *)
%o A168328 (Magma) [n eq 1 select 0 else 6*n-Self(n-1)-6: n in [1..70]]; // _Vincenzo Librandi_, Sep 17 2013
%Y A168328 Cf. A004526, A008588.
%K A168328 nonn,easy,less
%O A168328 1,2
%A A168328 _Vincenzo Librandi_, Nov 23 2009
%E A168328 G.f. adapted to the offset by _Vincenzo Librandi_, Sep 17 2013
%E A168328 New definition by _Bruno Berselli_, Sep 18 2013