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 A017930 #15 Sep 08 2022 08:44:43 %S A017930 1,3,8,23,64,182,512,1449,4096,11586,32768,92682,262144,741456, %T A017930 2097152,5931642,16777216,47453133,134217728,379625063,1073741824, %U A017930 3037000500,8589934592,24296004000,68719476736 %N A017930 Powers of sqrt(8) rounded up. %H A017930 Vincenzo Librandi, <a href="/A017930/b017930.txt">Table of n, a(n) for n = 0..1000</a> %F A017930 a(n) = A017912(3n). - _R. J. Mathar_, Apr 28 2008 %t A017930 Ceiling[(Sqrt[8])^Range[0,40]] (* _Vincenzo Librandi_, Nov 21 2011 *) %o A017930 (Magma) [Ceiling(Sqrt(8^n)): n in [0..30]]; // _Vincenzo Librandi_, Nov 21 2011 %o A017930 (PARI) a(n)=ceil(sqrt(8)^n) \\ _Charles R Greathouse IV_, Nov 21 2011 %K A017930 nonn %O A017930 0,2 %A A017930 _N. J. A. Sloane_