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 A309208 #20 Aug 05 2019 16:43:11 %S A309208 1,1,2,2,5,2,8,2,8,8,7,3,0,5,8,2,2,1,9,5,1,1,2,9,9,3,1,1,3,8,8,2,6,5, %T A309208 4,0,1,2,0,8,2,5,4,4,3,2,3,4,4,9,7,8,7,0,1,0,7,3,5,9,5,1,4,6,2,3,4,8, %U A309208 4,1,0,7,7,5,3,7,6,5,2,3,3,7,9,2,8,1,3,5,3,9,7,7,7,2,6,2,9,6,5,4,3,9,1,6,9,9 %N A309208 Decimal expansion of (3 tanh (3 tanh (3 tanh (...))))^(-2). %C A309208 This is the decimal expansion of 1/x^2 where x is the constant defined in A309211. %H A309208 W. M. Gosper, <a href="/A309204/a309204.pdf">Material from Bill Gosper's Computers & Math talk, M.I.T., 1989</a>, i+38+1 pages, annotated and scanned, included with the author's permission. (There are many blank pages because about half of the original pages were two-sided, half were one-sided.) %e A309208 .1122528288730582219511299311388265401208... %Y A309208 Cf. A309207, A309211. %K A309208 nonn,cons %O A309208 0,3 %A A309208 _N. J. A. Sloane_, Jul 29 2019 %E A309208 More terms from _Daniel Suteu_, Jul 30 2019