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 A171384 #6 Feb 06 2015 17:03:04 %S A171384 1,4,4,6,6,9,10,13,18,18,23,26,27,30,34,39,40,45,47,48,53,56,61,68,70, %T A171384 71,74,75,78,91,93,98,99,108,108,113,118,121,125,130,131,140,141,143, %U A171384 144,155,166,169,170,172,177,178,187,192,197,201,202,207,210,210,219 %N A171384 a(n) = A140475(n) - A167707(n). %e A171384 a(1)=1-0=1, a(2)=5-1=4, a(3)=7-3=4, a(4)=11-5=6, a(5)=13-7=6, a(6)=17-8=9. %Y A171384 Cf. A140475, A167707. %K A171384 nonn %O A171384 1,2 %A A171384 _Juri-Stepan Gerasimov_, Dec 07 2009 %E A171384 Edited by _Omar E. Pol_, Apr 14 2010