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 A308258 #20 Jun 11 2019 19:58:17
%S A308258 6,2,6,5,2,7,5,6,8,8,1,2,8,0,6,7,2,2,0,7,0,1,8,3,3,6,6,2,3,1,1,2,5,1,
%T A308258 5,3,9,0,5,1,2,2,7,7,8,1,0,9,2,6,9,4,0,4,9,4,2,6,4,9,8,8,3,5,4,7,4,0,
%U A308258 1,5,9,8,1,3,2,8,7,6,6,4,9,8,4,7,9,4,6,4,8,9,6,6,6,6,2,8,1,4,0,2,6,7,2,7,5,3,2,5,0,9,6,7,1,8,4,9,9,4,7,0
%N A308258 Decimal expansion of convergent series Sum_{n >= 1} (sin(n)/2)^n.
%e A308258 0.6265275688128...
%o A308258 (PARI) suminf(n = 1, (sin(n) / 2)^n)
%K A308258 cons,nonn
%O A308258 0,1
%A A308258 _Neven Sajko_, Jun 11 2019