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 A334952 #13 May 26 2020 06:31:45 %S A334952 0,-1,2,-2,4,-3,6,-4,0,-5,10,-6,12,-7,14,-8,0,-9,18,-10,0,-11,22,-12, %T A334952 0,-13,26,-14,0,-15,30,-16,0,-17,34,-18,36,-19,38,-20,0,-21,42,-22,0, %U A334952 -23,0,-24,48,-25,0,-26,52,-27,0,-28,56,-29,0,-30,60,-31,0,-32,64,-33,66,-34,68,-35,0,-36,72,-37 %N A334952 First differences of A334950. %C A334952 The absolute value of a(n) is also the length of the n-th vertical-line-segment in the diagram of A334950. %H A334952 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a> %F A334952 a(2k+1) = -(k + 1), k >= 0. %Y A334952 Cf. A001478, A005132, A334950, A334951. %K A334952 sign %O A334952 0,3 %A A334952 _Omar E. Pol_, May 17 2020