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 A171923 #3 Mar 30 2012 17:40:16 %S A171923 2,4,6,12,18,24,30,52,64,66,68,100,108,112,144,158,160,162,182,194, %T A171923 218,226,228,230,244,264,266,288,290,312 %N A171923 Records in A031883 (values). %F A171923 a(n) = A031883(A171924(n)) . [From _R. J. Mathar_, Oct 24 2010] %Y A171923 Cf. A000959, A031883, A171924. %K A171923 nonn %O A171923 1,1 %A A171923 R. J. Mathar, Oct 23 2010 %E A171923 a(16)-a(30) from _Donovan Johnson_, Oct 24 2010