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 A325748 #4 Jun 07 2019 22:00:34
%S A325748 0,0,1,-3,6,-9,9,0,-27,81,-161,231,-165,-363,2079,-6435,16071,-35343,
%T A325748 70686,-130339,222717,-352715,515944,-692967,849299,-950455,996435,
%U A325748 -1042415,1042415,1,-6926071,36516481,-137549665,436362817,-1233496132,3197432557
%N A325748 First term of n-th difference sequence of (floor(k/e)), k >= 0.
%H A325748 Clark Kimberling, <a href="/A325748/b325748.txt">Table of n, a(n) for n = 1..200</a>
%t A325748 Table[First[Differences[Table[Floor[n/E], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325748 Cf. A068985.
%K A325748 easy,sign
%O A325748 1,4
%A A325748 _Clark Kimberling_, Jun 07 2019