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 A325752 #11 Jun 11 2019 08:55:55
%S A325752 1,0,0,0,0,0,0,0,0,0,1,-11,66,-286,1001,-3003,8008,-19448,43758,
%T A325752 -92378,184757,-352737,646877,-1145837,1971882,-3321890,5541965,
%U A325752 -9324315,16231215,-30045015,60090031,-129024511,290305576,-665732936,1523150156,-3431847188
%N A325752 First term of n-th difference sequence of (floor(r*k)), r = log(3), k >= 0.
%H A325752 Clark Kimberling, <a href="/A325752/b325752.txt">Table of n, a(n) for n = 1..200</a>
%H A325752 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a325/A325752.java">Java program</a> (github)
%t A325752 Table[First[Differences[Table[Floor[n*Log[3]], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325752 Cf. A002391, A059543.
%K A325752 easy,sign
%O A325752 1,12
%A A325752 _Clark Kimberling_, Jun 07 2019