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 A017570 #16 Aug 31 2018 02:53:24 %S A017570 16,256,784,1600,2704,4096,5776,7744,10000,12544,15376,18496,21904, %T A017570 25600,29584,33856,38416,43264,48400,53824,59536,65536,71824,78400, %U A017570 85264,92416,99856,107584,115600 %N A017570 a(n) = (12*n + 4)^2. %H A017570 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1). %F A017570 G.f.: 16*(1 + 13*x + 4*x^2)/(1-x)^3. %F A017570 a(n) = 16*A016778(n). %F A017570 a(n) = a(n-1) + 288*n - 48, n >= 1. - _Vincenzo Librandi_, Mar 20 2011 %o A017570 (PARI) a(n)=(12*n+4)^2 \\ _Charles R Greathouse IV_, Jun 17 2017 %K A017570 nonn,easy %O A017570 0,1 %A A017570 _N. J. A. Sloane_