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 A073239 #6 Nov 21 2013 12:47:51
%S A073239 0,2,7,4,2,5,6,9,3,1,2,3,2,9,8,1,0,6,1,1,9,5,5,6,2,7,0,8,5,9,0,9,6,5,
%T A073239 9,4,4,5,4,4,2,5,1,1,4,5,3,7,4,4,8,3,0,7,7,6,3,3,8,6,7,9,1,3,2,6,4,0,
%U A073239 2,3,9,5,8,0,1,2,3,0,3,9,6,7,2,0,9,0,1,7,6,6,9,3,4,2,8,9,6,1,9,4,7,0,6,4
%N A073239 Decimal expansion of (1/Pi)^Pi.
%C A073239 (1/Pi)^Pi = Pi^(-Pi) = 1/(Pi^Pi) (reciprocal of A073233).
%e A073239 0.02742569312329810611955627085...
%t A073239 Join[{0},RealDigits[(1/Pi)^Pi,10,120][[1]]] (* _Harvey P. Dale_, Nov 30 2011 *)
%o A073239 (PARI) (1/Pi)^Pi
%Y A073239 Cf. A000796 (Pi), A049541 (1/Pi), A073238 (Pi^(1/Pi)), A073240 ((1/Pi)^(1/Pi)), A073233 (Pi^Pi).
%K A073239 cons,nonn
%O A073239 0,2
%A A073239 _Rick L. Shepherd_, Jul 25 2002