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 A309207 #22 Aug 05 2019 16:41:32 %S A309207 2,1,64,2,1,1,1,3,4,1,2,3,1,272213,1,2,1,16,110,4,4,4,1,1,1,4,1,1,916, %T A309207 21,11,6,2,2,2,1,2,16,3,1,1,2,2,9,1,2,8,2,4,3,2,2,1,9,6,5,3,1,4,2,12, %U A309207 17,1,3,1,3,1,1,3,1,7,1,1,2,8,2,1,1,5,11,90,1 %N A309207 Continued fraction expansion of (3 tanh (3 tanh (3 tanh (...)))). %C A309207 This is the continued fraction expansion of the constant defined in A309211. %H A309207 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.) %t A309207 ContinuedFraction[Reduce[x == 3 Tanh@x, x, Reals][[3, 2]], 33] (* _Bill Gosper_, Jul 30 2019 *) %Y A309207 Cf. A309208, A309211. %K A309207 nonn,cofr %O A309207 0,1 %A A309207 _N. J. A. Sloane_, Jul 29 2019 %E A309207 More terms from _Daniel Suteu_, Jul 30 2019