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 A325742 #4 Jun 05 2019 21:51:37
%S A325742 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,-22,253,-2024,12650,
%T A325742 -65780,296010,-1184040,4292145,-14307150,44352165,-129024480,
%U A325742 354817320,-927983760,2319959400,-5567902560,12875774670,-28781143380,62359143990
%N A325742 First term of n-th difference sequence of (floor(Pi*k/3)), k >= 0.
%H A325742 Clark Kimberling, <a href="/A325742/b325742.txt">Table of n, a(n) for n = 1..200</a>
%t A325742 Table[First[Differences[Table[Floor[(Pi/3)*n], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325742 Cf. A019670, A325664.
%K A325742 easy,sign
%O A325742 1,23
%A A325742 _Clark Kimberling_, Jun 05 2019