2^3^4 = ?

Excel 2003 2^3^4 = 4096
Matlab 7.10.0.499 (R2010a) 2^3^4 = 4096
QtOctave 3.2.4 2^3^4 = 4096
Freemat 4.0 2^3^4 = 2.4179e+024
Scilab 5.4.0alpha 2^3^4 = 2.418D+24
Sage 2^3^4 = 2417851639229258349412352
Python 2.7.2 2**3**4 = 2417851639229258349412352
Mathematica 8.0 2^3^4 = 2417851639229258349412352
R 2.11.0 2^3^4 = 2.417852e+24
Google 2^3^4 = 2^(3^4) = 2.41785164 × 10^24
Yahoo 2^3^4 = 2.41785164E+24
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