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 A171433 #4 Mar 30 2012 18:52:38 %S A171433 1,6,8,13,17,25,32,42,49,65,70,86,93,109,116,121,137,144,160,167,183, %T A171433 202,239,247,263,294,319,335,346,359,369,445,452,456,472,485,555,562, %U A171433 572,579,595,626,667,692,700,707,717,772,785,801,805,866,873,898,914 %N A171433 n-th half of even single (or even isolated) numbers plus n-th half of even non-single (or even nonisolated) numbers. %F A171433 a(n)=A168497(n)+A168044(n). %e A171433 a(1)=1+0=1, a(2)=2+4=6, a(3)=3+5=8. %Y A171433 Cf. A167706(the single or isolated numbers), A167707(the non-single or nonisolatred numbers), A168044, A168497. %K A171433 nonn %O A171433 1,2 %A A171433 _Juri-Stepan Gerasimov_, Dec 09 2009 %E A171433 Entries checked by _R. J. Mathar_, May 23 2010