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 A197716 #16 Feb 04 2025 16:41:09 %S A197716 3,21,255,4633,110409,3243618,113177497,4570858600,209655304353, %T A197716 10763674952098,611433842280388,38071427445729201,2578294348444597267, %U A197716 188670154792420320215,14834716200104606205408,1247263229999781126495328,111661618863544248806155260 %N A197716 a(n) = ceiling((2n+1/n)^n). %H A197716 Vincenzo Librandi, <a href="/A197716/b197716.txt">Table of n, a(n) for n = 1..300</a> %t A197716 Array[Ceiling[(2*# + 1/#)^#] &, 20] (* _Paolo Xausa_, Feb 04 2025 *) %o A197716 (Magma) [Ceiling((2*n+1/n)^n): n in [1..20]] %o A197716 (PARI) a(n)=ceil((2*n+1/n)^n) \\ _Charles R Greathouse IV_, Nov 21 2011 %Y A197716 Cf. A014058. %K A197716 nonn,less %O A197716 1,1 %A A197716 _Vincenzo Librandi_, Oct 18 2011