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 A171178 #4 Mar 30 2012 17:34:03 %S A171178 0,2,1,6,3,5,4,12,7,11,8,10,9,20,13,19,14,18,15,17,16,30,21,29,22,28, %T A171178 23,27,24,26,25,42,31,41,32,40,33,39,34,38,35,37,36,56,43,55,44,54,45, %U A171178 53,46,52,47,51,48,50,49,72,57,71,58,70,59,69,60,68 %N A171178 Permutation of the natural numbers: 0 together with the partial sums of A171177. %C A171178 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 A171166. %C A171178 For another version see A171175. %H A171178 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A171178 Cf. A000027, A005132, A171164, A161165, A161166, A171172, A171173, A171174, A171175, A171176, A171178, A172310. %K A171178 easy,nonn %O A171178 0,2 %A A171178 _Omar E. Pol_, Feb 23 2010