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 A152738 #9 Sep 08 2022 08:45:39 %S A152738 0,0,2,5,9,15,22,30,39,50,61,74,88,104,121,139,158,178,200,223,247, %T A152738 272,299,326,355,386,417,450,484,519,556,593,632,673,714,757,800,846, %U A152738 892,940,988,1038,1090,1142,1196,1251,1307,1365,1423,1483,1545,1607,1671 %N A152738 a(n) = floor((n^2)/phi). %H A152738 G. C. Greubel, <a href="/A152738/b152738.txt">Table of n, a(n) for n = 0..5000</a> %t A152738 a[n_]:=Floor[(n^2)/GoldenRatio]; %o A152738 (PARI) a(n)=n^2\((1+sqrt(5))/2) \\ _Charles R Greathouse IV_, Jul 29 2011 %o A152738 (Magma) phi:=(1+Sqrt(5))/2; [Floor(n^2/phi): n in [0..30]]; // _G. C. Greubel_, Sep 01 2018 %Y A152738 Cf. A014217, A152737, A032616, A032635. %K A152738 nonn %O A152738 0,3 %A A152738 _Vladimir Joseph Stephan Orlovsky_, Dec 12 2008 %E A152738 Offset corrected by B. D. Swan, Jan 03 2009