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 A093590 #15 Dec 25 2015 00:15:29
%S A093590 2,7,4,5,3,6,8,0,2,3,5,6,7,4,6,3,4,8,4,7,0,9,8,4,9,2,8,9,5,5,1,2,0,3,
%T A093590 8,4,4,7,1,1,0,7,7,4,8,7,7,9,2,4,1,8,0,5,3,0,6,3,1,9,9,2,5,1,3,8,9,5,
%U A093590 2,0,4,8,2,6,5,6,7,5,9,4,1,0,6,8,4,0,5,0,4,8,9,1,0,2,1,5,4,2,6,3,9,9,5,6,2
%N A093590 Decimal expansion of the number x defined by x^x = 16.
%C A093590 This is a kind of mean of 2 and 4 because 2^4 = 4^2 = 16.
%H A093590 Harry J. Smith, <a href="/A093590/b093590.txt">Table of n, a(n) for n = 1..20000</a>
%F A093590 4*log(2)/LambertW(4*log(2)). - _Vladeta Jovovic_, Apr 11 2004
%e A093590 2.74536802356746348470984928955120384471107748779241805306319925138952048....
%t A093590 RealDigits[ Log[16]/ProductLog[ Log[16]], 10, 111][[1]] (* _Robert G. Wilson v_, Apr 24 2004 *)
%o A093590 (PARI) { default(realprecision, 20080); x=solve(x=2, 3, x^x - 16); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b093590.txt", n, " ", d)); } \\ _Harry J. Smith_, Jun 19 2009
%K A093590 nonn,cons
%O A093590 1,1
%A A093590 David C. Smith (extra314(AT)hotmail.com), Apr 02 2004