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 A325751 #4 Jun 09 2019 01:26:59
%S A325751 0,1,-1,0,3,-9,18,-27,27,0,-81,243,-485,715,-624,-559,4550,-14976,
%T A325751 39286,-92378,203034,-424346,848692,-1625754,2977832,-5200299,8628633,
%U A325751 -13553462,20083622,-28009215,36801609,-45932172,55400904,-64869636,64869636,0,-349578528
%N A325751 First term of n-th difference sequence of (floor(r*k)), r = log(2), k >= 0.
%H A325751 Clark Kimberling, <a href="/A325751/b325751.txt">Table of n, a(n) for n = 1..200</a>
%t A325751 Table[First[Differences[Table[Floor[n*Log[2]], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325751 Cf. A002162.
%K A325751 easy,sign
%O A325751 1,5
%A A325751 _Clark Kimberling_, Jun 07 2019