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 A190297 #12 Sep 18 2022 11:38:13 %S A190297 1,12,57,245,1005,4063,16327,65435,261965,1048259,4193742,16776218, %T A190297 67107091,268432305,1073736223,4294957340,17179851485,68719445272, %U A190297 274877851009,1099511528337,4398046334325,17592185730143,70368743618958,281474975717403,1125899905076842 %N A190297 Bisection of A013697. %F A190297 a(n) = floor(1/(zeta(2n)-1)). %K A190297 nonn %O A190297 1,2 %A A190297 _N. J. A. Sloane_, May 13 2011