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 A325730 #7 May 22 2019 22:57:05
%S A325730 0,1,-2,4,-8,16,-31,56,-91,126,-126,0,462,-1715,4704,-11319,25186,
%T A325730 -52920,105840,-201684,364609,-618772,964173,-1309574,1309574,1,
%U A325730 -4970097,18874639,-52835258,129107566,-290081057,612479308,-1227418279,2343572690,-4261482736
%N A325730 First term of n-th difference sequence of (floor(k*r)), r = sqrt(1/3), k >= 0.
%H A325730 Clark Kimberling, <a href="/A325730/b325730.txt">Table of n, a(n) for n = 1..200</a>
%t A325730 Table[First[Differences[Table[Floor[Sqrt[1/3]*n], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325730 Cf. A325664.
%K A325730 easy,sign
%O A325730 1,3
%A A325730 _Clark Kimberling_, May 19 2019