%I M3559 N1441
%S 4,19,556,2945786,1201330980739424,1846150007042109336331740689419264,
%T 44872306407070078313805671235110493948692333391216774983943586135973888
%N Number of switching networks (see Harrison reference for precise definition).
%C Number of equivalence classes with permutation and complementation of n variables on the domain and complementation of 2 variables on the range. [Sean A. Irvine, Aug 07 2011]
%D M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313327.
%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_, Aug 07 2011
