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 A325671 #9 Feb 20 2022 08:16:58
%S A325671 -3,1,-2,4,-8,16,-32,64,-128,256,-511,1012,-1969,3718,-6721,11440,
%T A325671 -17875,24310,-24310,1,92357,-352484,997568,-2485241,5754023,
%U A325671 -12680954,26924183,-55410641,110821282,-215426354,406270424,-740354803,1294617071,-2145852302
%N A325671 First term of n-th difference sequence of (floor(k*r)), r = -sqrt(6), k >= 0.
%H A325671 Clark Kimberling, <a href="/A325671/b325671.txt">Table of n, a(n) for n = 1..200</a>
%t A325671 Table[First[Differences[Table[Floor[-Sqrt[6]*n], {n, 0, 30}], n]], {n, 0, 50}]
%Y A325671 Cf. A022840, A325664, A325670.
%K A325671 easy,sign
%O A325671 1,1
%A A325671 _Clark Kimberling_, May 15 2019