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 A122790 #6 Feb 28 2015 16:01:36
%S A122790 9,4,7,7,9,5,5,5,5,6,5,5,9,2,7,4,7,3,6,9,1,6,6,8,1,0,1,2,5,8,9,0,4,1,
%T A122790 9,4,2,2,8,1,8,7,1,6,0,4,4,2,7,2,9,9,7,1,5,9,2,7,4,4,2,3,5,6,6,6,7,0,
%U A122790 1,5,3,2,2,1,6,2,4,8,2,8,1,7,7,5,6,1,0,6,8,5,6,5,5,7,3,1,0,4,0,2,6,4,4,4,3
%N A122790 Decimal expansion of Wagon's constant: the average "dropping time" of the Collatz (3x+1) iteration.
%F A122790 Sum_{k>0} A122437(k+1)*A100982(k)/2^(A020914(k)-1) = 9.47795555655927473691668101258904...
%Y A122790 Cf. A060445 (dropping time of the 3x+1 iteration starting at 2n+1), A100982, A122791.
%K A122790 cons,nonn
%O A122790 1,1
%A A122790 _T. D. Noe_, Sep 11 2006