%I M4913 N2106 #19 Mar 04 2015 20:45:07
%S 13,158,66336,122544034314,3438726436264160394888822,
%T 22703637642460032506699838997723739937009913804573344
%N Number of switching networks (see Harrison reference for precise definition).
%C Next term is too big to list here. Equivalence is permutation and complementation of n variables on the domain and permutation of 3 variables on the output. - _Sean A. Irvine_, Jul 12 2011
%D M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H <a href="/index/Sw#switching">Index entries for sequences related to switching networks</a>
%K nonn
%O 1,1
%A _N. J. A. Sloane_
%E More terms from _Sean A. Irvine_, Jul 11 2011