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 A325750 #8 Jun 19 2025 09:19:20
%S A325750 1,0,1,-3,6,-9,9,0,-27,81,-161,231,-165,-363,2079,-6435,16071,-35343,
%T A325750 70686,-130339,222717,-352715,515944,-692967,849299,-950455,996435,
%U A325750 -1042415,1042415,0,-6926040,36515985,-137544209,436316441,-1233171500,3195484765
%N A325750 First term of n-th difference sequence of (floor(r*k)), r = (1+sqrt(3))/2, k >= 0.
%H A325750 Clark Kimberling, <a href="/A325750/b325750.txt">Table of n, a(n) for n = 1..200</a>
%t A325750 Table[First[Differences[Table[Floor[m*(1+Sqrt[3])/2], {m, 0, n}], n]], {n, 1, 50}]
%Y A325750 Cf. A003511.
%K A325750 easy,sign
%O A325750 1,4
%A A325750 _Clark Kimberling_, Jun 07 2019