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 A325737 #4 Jun 03 2019 19:47:46
%S A325737 8,0,0,0,0,0,1,-7,28,-84,210,-462,925,-1729,3094,-5460,9828,-18564,
%T A325737 37128,-77519,164710,-347984,719719,-1444170,2796248,-5200299,9230104,
%U A325737 -15459444,23888319,-32317194,32317194,0,-124040423,476768435,-1358719271,3407426841
%N A325737 First term of n-th difference sequence of (floor(3e*k)), k >= 0.
%H A325737 Clark Kimberling, <a href="/A325737/b325737.txt">Table of n, a(n) for n = 1..200</a>
%t A325737 Table[First[Differences[Table[Floor[3E*n], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325737 Cf. A325664.
%K A325737 easy,sign
%O A325737 1,1
%A A325737 _Clark Kimberling_, May 23 2019