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 A171175 #4 Mar 30 2012 17:34:03 %S A171175 0,2,1,5,4,6,3,10,9,11,8,12,7,17,16,18,15,19,14,20,13,26,25,27,24,28, %T A171175 23,29,22,30,21,37,36,38,35,39,34,40,33,41,32,42,31,50,49,51,48,52,47, %U A171175 53,46,54,45,55,44,56,43,65,64,66,63,67,62,68 %N A171175 Permutation of the natural numbers: 0 together with the partial sums of A171174. %C A171175 a(n) is also the value of "x" and "y" of the n-th point (x,y), located on the infinite straight line (0,0),(1,1)..., that is intercepted by the path in structure of A171165. %C A171175 For another version see A171178. %H A171175 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A171175 Cf. A000027, A005132, A171164, A161165, A161166, A171172, A171173, A171174, A171176, A171177, A171178. %K A171175 easy,nonn %O A171175 0,2 %A A171175 _Omar E. Pol_, Feb 23 2010