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 A060505 #13 Jul 03 2018 02:27:57
%S A060505 2,1,0,1,1,1,2,4,6,10,16,28,48,83,145,256,453,809,1452,2621,4755,8665,
%T A060505 15857,29127,53687,99273,184112,342392,638372,1193046,2234634,4194304,
%U A060505 7887910,14861478,28048766,53024287,100393684,190358661,361443664
%N A060505 a(n) = floor(2^n/(n^2)).
%H A060505 Harry J. Smith, <a href="/A060505/b060505.txt">Table of n, a(n) for n = 1..200</a>
%F A060505 a(n) = floor(A000079(n)/A000290(n+1)).
%t A060505 Table[Floor[2^w/(w^2)], {w, 1, 40}];
%o A060505 (PARI) a(n)={floor(2^n/(n^2))} \\ _Harry J. Smith_, Jul 06 2009
%K A060505 easy,nonn
%O A060505 1,1
%A A060505 _Labos Elemer_, Apr 11 2001