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 A094386 #16 Sep 08 2022 08:45:13
%S A094386 1,3,6,13,27,55,110,221,443,886,1773,3547,7094,14188,28377,56755,
%T A094386 113511,227023,454046,908093,1816186,3632373,7264747,14529495,
%U A094386 29058990,58117981,116235962,232471924,464943848,929887696,1859775393,3719550786
%N A094386 a(n) = floor(sqrt(3)*2^(n-1)).
%H A094386 Vincenzo Librandi, <a href="/A094386/b094386.txt">Table of n, a(n) for n = 1..1000</a>
%F A094386 a(n) = A022838(2^(n-1)). - _R. J. Mathar_, Oct 22 2011
%t A094386 Table[Floor[Sqrt[3] 2^(n-1)], {n, 40}] (* _Vincenzo Librandi_, Sep 20 2017 *)
%o A094386 (Magma) [Floor(2^(n-1)*Sqrt(3)): n in [1..40]]; // _Vincenzo Librandi_, Sep 20 2017
%o A094386 (PARI) a(n) = floor(sqrt(3)*2^(n-1)); \\ _Michel Marcus_, Sep 20 2017
%o A094386 (Python)
%o A094386 from math import isqrt
%o A094386 def A094386(n): return isqrt(3*(1<<(n-1<<1))) # _Chai Wah Wu_, Jul 28 2022
%K A094386 nonn
%O A094386 1,2
%A A094386 _Roger L. Bagula_, Jun 03 2004