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 A248950 #13 Oct 20 2014 18:10:48
%S A248950 2,1,7,6,3,0,5,1,4,7,7,7,5,8,3,2,4,0,2,1,8,6,2,2,9,5,6,9,8,6,3,9,3,6,
%T A248950 4,7,9,3,4,9,4,3,9,2,0,3,1,9,1,6,9,8,1,5,4,4,9,5,1,6,5,1,5,5,0,6,2,8,
%U A248950 6,6,7,1,8,6,7,1,5,4,4,8,2,5,4,6,2,1,4,6,0,3,5,0,0,2,8,8,7,6,1,9,4,2,9,3,5
%N A248950 Decimal expansion of sum_{n >= 1} sin(2/n^2).
%H A248950 Vaclav Kotesovec, <a href="/A248950/b248950.txt">Table of n, a(n) for n = 1..500</a>
%e A248950 2.1763051477758324021862295698639364793494392031916981544951651550628667...
%p A248950 evalf(sum(sin(2/n^2), n=1..infinity), 120); # _Vaclav Kotesovec_, Oct 20 2014
%t A248950 (* N[Sum[Sin[2/n^2], {n, 1, Infinity}], 120], yields only 26 correct decimals *)
%o A248950 (PARI) default(realprecision,120); sumpos(n=1,sin(2/n^2)) \\ _Vaclav Kotesovec_, Oct 20 2014
%Y A248950 Cf. A248946, A248947, A248949.
%K A248950 nonn,easy,cons
%O A248950 1,1
%A A248950 _Clark Kimberling_, Oct 18 2014