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 A017928 #21 Sep 08 2022 08:44:43 %S A017928 1,2,8,22,64,181,512,1448,4096,11585,32768,92681,262144,741455, %T A017928 2097152,5931641,16777216,47453132,134217728,379625062,1073741824, %U A017928 3037000499,8589934592,24296003999,68719476736 %N A017928 Powers of sqrt(8) rounded down. %H A017928 Vincenzo Librandi, <a href="/A017928/b017928.txt">Table of n, a(n) for n = 0..1000</a> %F A017928 a(n) = A017910(3n). - _R. J. Mathar_, Apr 28 2008 %t A017928 Floor[(Sqrt[8])^Range[0,40]] (* _Harvey P. Dale_, Jun 20 2011 *) %o A017928 (PARI) a(n)=sqrtint(8^n) \\ _Charles R Greathouse IV_, Nov 18 2011 %o A017928 (Magma) [Floor(Sqrt(8^n)): n in [0..40]]; // _Vincenzo Librandi_, Nov 20 2011 %Y A017928 Cf. A017910. %K A017928 nonn %O A017928 0,2 %A A017928 _N. J. A. Sloane_