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 A018123 #18 Jul 08 2025 06:27:19
%S A018123 1,1,1,2,3,4,5,6,9,12,16,21,27,36,48,64,84,111,147,194,256,337,445,
%T A018123 588,776,1024,1351,1782,2352,3104,4096,5404,7131,9410,12416,16384,
%U A018123 21618,28526,37640,49667,65536,86475,114104,150562,198668,262144,345901,456419,602248,794672,1048576
%N A018123 Powers of fifth root of 4 rounded down.
%H A018123 Vincenzo Librandi, <a href="/A018123/b018123.txt">Table of n, a(n) for n = 0..2000</a>
%p A018123 a:= n-> floor(4^(n/5)):
%p A018123 seq(a(n), n=0..50); # _Alois P. Heinz_, Jun 11 2025
%t A018123 Table[Floor[(4^(1/5))^n],{n,0,35}] (* _Vincenzo Librandi_, Jun 11 2025 *)
%o A018123 (Magma) seq := [Floor(4^(n/5)) : n in [0..50]]; seq; // _Vincenzo Librandi_, Jun 11 2025
%Y A018123 Cf. A005533.
%K A018123 nonn
%O A018123 0,4
%A A018123 _N. J. A. Sloane_