%I A001695 M2352 N0929
%S A001695 1,3,4,8,65536
%N A001695 An Ackermann function.
%D A001695 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001695 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001695 W. Ackermann, Zum Hilbertschen Aufbau der reellen Zahlen, Math. Ann. 
               99 (1928), 118-133.
%D A001695 R. C. Buck, Mathematical induction and recursive definitions, Amer. Math. 
               Monthly, 70 (1963), 128-135.
%D A001695 Y. Sundblad, The Ackermann function. A theoretical, computational and 
               formula manipulative study, Nordisk Tidskr. Informationsbehandling 
               (BIT) 11 (1971), 107-119.
%H A001695 W. Ackermann, <a href="http://134.76.163.65/servlet/digbib?template=view.html&id=29309&startpage=122&endpage=\
               137&image-path=http://134.76.176.141/cgi-bin/letgifsfly.cgi&image-subpath=/
               1417&image-subpath=1417&pagenumber=122&imageset-id=1417">Zum Hilbertschen 
               Aufbau der reellen Zahlen</a>, Math. Ann. 99 (1928), 118-133.
%H A001695 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               AckermannFunction.html">Link to a section of The World of Mathematics.</
               a>
%Y A001695 Cf. A014221, A046859.
%Y A001695 Sequence in context: A096847 A011993 A154714 this_sequence A019676 A019900 
               A122791
%Y A001695 Adjacent sequences: A001692 A001693 A001694 this_sequence A001696 A001697 
               A001698
%K A001695 nonn,nice
%O A001695 0,2
%A A001695 N. J. A. Sloane (njas(AT)research.att.com).
%E A001695 a(5)=2^2^...^2, with 2^2^...^2 [ with 65536 two's ] two's.