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 A325747 #4 Jun 06 2019 22:00:51
%S A325747 2,1,-2,4,-7,10,-10,0,35,-125,325,-725,1451,-2639,4355,-6435,8255,
%T A325747 -8567,5863,-455,910,-40105,210418,-733447,2085525,-5200299,11748373,
%U A325747 -24416951,46909837,-82930835,132479945,-182029055,182029055,1,-670853985,2480588545
%N A325747 First term of n-th difference sequence of (floor(r*k)), r = (3+sqrt(5))/2, k >= 0.
%C A325747 Differs from A325745 in first term only.
%H A325747 Clark Kimberling, <a href="/A325747/b325747.txt">Table of n, a(n) for n = 1..200</a>
%t A325747 Table[First[Differences[Table[Floor[n*GoldenRatio^2], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325747 Cf. A001950, A001622, A325745.
%K A325747 easy,sign
%O A325747 1,1
%A A325747 _Clark Kimberling_, Jun 06 2019