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 A221944 #13 Sep 08 2022 08:46:04 %S A221944 1,2,4,7,12,22,38,66,114,198,343,595,1030,1785,3092,5357,9278,16071, %T A221944 27835,48213,83507,144639,250523,433919,751571,1301759,2254713, %U A221944 3905277,6764139,11715833,20292418,35147500,60877256,105442501,182631769,316327504,547895309,948982513,1643685929,2846947541,4931057788 %N A221944 Floor(sqrt(2*3^n)). %H A221944 Vincenzo Librandi, <a href="/A221944/b221944.txt">Table of n, a(n) for n = 0..1000</a> %t A221944 Floor[Sqrt[2 3^Range[0,40]]] (* _Harvey P. Dale_, Mar 09 2014 *) %o A221944 (PARI) a(n)=sqrtint(2*3^n) \\ _Charles R Greathouse IV_, Apr 18 2013 %o A221944 (Magma) [Floor(Sqrt(2*3^n)): n in [0..40]]; // _Vincenzo Librandi_, Mar 11 2014 %Y A221944 Cf. A017910, A017913, A017919, A114183, A221718, A221942-A221946. %K A221944 nonn %O A221944 0,2 %A A221944 _N. J. A. Sloane_, Feb 01 2013