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 A140801 #10 Jan 24 2017 14:35:07 %S A140801 360,1080,1800,2520,3240,3960,4680,5400,6120,6840,7560,8280,9000,9720, %T A140801 10440,11160,11880,12600,13320,14040,14760,15480,16200,16920,17640, %U A140801 18360,19080,19800,20520,21240,21960,22680,23400,24120,24840,25560,26280,27000,27720,28440,29160 %N A140801 a(0)=360, a(n)=a(n-1)+720 for n>=1. %F A140801 a(n) = 360+720*n %t A140801 NestList[720+#&,360,40] (* or *) 720*Range[0,40]+360 (* _Harvey P. Dale_, Jan 24 2017 *) %Y A140801 A069476 (same sequence, starting with 2520). %K A140801 nonn,easy,less %O A140801 0,1 %A A140801 _Paul Curtz_, Jul 15 2008