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 A342276 #13 Mar 14 2021 20:35:54 %S A342276 1,1,2,0,0,4,4,-4,-4,4,6,4,-2,4,8,-12,-12,4,6,4,0,8,16,0,-18,-4,16,14, %T A342276 -4,4,12,-30,-28,4,6,4,0,8,16,0,-16,0,20,20,4,4,24,-8,-50,-20,16,14,4, %U A342276 16,40,16,-40,-28,28,38,-6,0,14,-68,-60,4,6,4 %N A342276 First differences of A342272. %C A342276 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 A342276 N. J. A. Sloane, <a href="/A342276/b342276.txt">Table of n, a(n) for n = 0..511</a> %Y A342276 Cf. A151723, A342272. %K A342276 sign %O A342276 0,3 %A A342276 _N. J. A. Sloane_, Mar 14 2021