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 A325733 #16 Jul 20 2019 22:20:25
%S A325733 1,1,-1,1,-1,1,-1,1,-1,1,-1,0,11,-77,363,-1364,4367,-12375,31823,
%T A325733 -75581,167959,-352715,705431,-1352078,2496167,-4457699,7728759,
%U A325733 -13055444,21572459,-35072309,56663099,-92561039,157073279,-286097759,572195518,-1251677664
%N A325733 First term of n-th difference sequence of (floor(k*r)), r = 1/2 + sqrt(2), k >= 0.
%H A325733 Clark Kimberling, <a href="/A325733/b325733.txt">Table of n, a(n) for n = 1..200</a>
%t A325733 Table[First[Differences[Table[Floor[(1/2+Sqrt[2])*n], {n, 0, 50}], n]], {n, 1, 50}]
%Y A325733 Cf. A325664. Inverse binomial transform of A137803.
%K A325733 easy,sign
%O A325733 1,13
%A A325733 _Clark Kimberling_, May 20 2019