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 A342627 #11 May 28 2021 02:51:35 %S A342627 0,-1,-1,-1,-1,0,0,-1,0,1,1,-1,2,-1,-2,-1,-1,0,0,1,-1,-1,0,1,-1,0,1, %T A342627 -2,0,0,2,3,-2,1,4,1,1,3,-2,1,3,1,2,0,-1,1,-2,2,-1,2,0,0,-3,-1,-1,-2, %U A342627 -4,-1,-4,3,-5,4,-3,2,-5,-1,-2,1,-2,0,1,2,-1,-1,-1 %N A342627 Second differences of the y-coordinates of the vertices of the Babylonian Wurm. %C A342627 Equivalently, the first differences of A342625. %H A342627 James Rayman, <a href="/A342627/b342627.txt">Table of n, a(n) for n = 1..10000</a> %H A342627 <a href="/index/Con#coordinates_2D_curves">Index entries for sequences related to coordinates of 2D curves</a> %F A342627 a(n) = A342623(n+2) - 2*A342623(n+1) + A342623(n). %o A342627 (Python) for i in range(10000): print(i+1, wurm(i+2)[1] - 2*wurm(i+1)[1] + wurm(i)[1]) # wurm is defined in the program for A256175 %Y A342627 See A256175 for the definition of the Babylonian Wurm. %Y A342627 See A342622 and A342623 for the coordinates of the Wurm. %Y A342627 See A342624 and A342625 for the first differences. %Y A342627 See A342626 for the second differences of the x-coordinates. %K A342627 sign,easy %O A342627 1,13 %A A342627 _James Rayman_, Apr 18 2021