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 A342275 #13 Mar 14 2021 20:35:48 %S A342275 0,1,-1,1,1,1,-3,1,1,2,0,-1,3,1,-7,1,1,2,0,0,4,4,-4,-5,3,5,2,-4,6,0, %T A342275 -15,1,1,2,0,0,4,4,-4,-4,4,6,4,-2,4,8,-12,-13,3,5,2,0,8,12,-4,-16,2, %U A342275 12,7,-10,10,-3,-31,1,1,2,0,0,4,4,-4,-4,4 %N A342275 First differences of A170899. %C A342275 It would be nice to have a formula or recurrence for any of A170899, A342272-A342278, or any nontrivial relation between them. This might help to understand the fractal structure of the mysterious hexagonal Ulam-Warburton cellular automaton A151723. %H A342275 N. J. A. Sloane, <a href="/A342275/b342275.txt">Table of n, a(n) for n = 0..4091</a> %Y A342275 Cf. A151723, A170899. %K A342275 sign %O A342275 0,7 %A A342275 _N. J. A. Sloane_, Mar 14 2021