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 A121235 #7 Jul 23 2013 12:13:08 %S A121235 14,19,28,47,61,75,191,197,205,242,302,515,742,1064,1104,1220,1266, %T A121235 1537,1757,1981,2208,2580,3505,3684,4484,4608,4788,6702,7385,7647, %U A121235 7909,8180,13614,14327,15557,22251,24377,29662,31331,34285,34348,35577,39323 %N A121235 Multiply-Add Recurrence Invariant (MARI) numbers. %C A121235 Contains A042983 and A007629 as subsets. %H A121235 M. Keith, <a href="http://www.cadaeic.net/mari.htm">Mari Numbers</a>. %Y A121235 Cf. A042983, A007629. %K A121235 nonn %O A121235 1,1 %A A121235 _R. J. Mathar_, Aug 21 2006