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 A342626 #13 May 28 2021 02:51:41 %S A342626 1,1,0,0,-2,-1,-1,2,1,2,1,0,1,0,-1,-1,-3,-1,-1,-2,1,3,1,3,-2,1,2,-5, %T A342626 -1,-1,-4,-2,1,-1,-1,0,0,1,-1,0,2,1,5,-1,-3,2,-4,3,-2,6,1,1,6,1,1,1,1, %U A342626 0,-1,1,-2,2,-1,1,-3,-1,-3,2,-5,1,3,3,-1,-1,-2,-5 %N A342626 Second differences of the x-coordinates of the vertices of the Babylonian Wurm. %C A342626 Equivalently, the first differences of A342624. %H A342626 James Rayman, <a href="/A342626/b342626.txt">Table of n, a(n) for n = 1..10000</a> %H A342626 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %F A342626 a(n) = A342622(n+2) - 2*A342622(n+1) + A342622(n). %o A342626 (Python) for i in range(10000): print(i+1, wurm(i+2)[0] - 2*wurm(i+1)[0] + wurm(i)[0]) # wurm is defined in the program for A256175 %Y A342626 See A256175 for the definition of the Babylonian Wurm. %Y A342626 See A342622 and A342623 for the coordinates of the Wurm. %Y A342626 See A342624 and A342625 for the first differences. %Y A342626 See A342627 for the second differences of the y-coordinates. %K A342626 sign,easy %O A342626 1,5 %A A342626 _James Rayman_, Apr 17 2021