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%I M2963 N1198 #19 Apr 01 2017 00:31:04
%S 3,13,308,1476218,600665577652576,923075003521054806676605033098240,
%T 22436153203535039156902835617555247833069649686831685624592283895635968
%N Number of n-input 2-output switching networks under action of S(n) and complementing group C(2,2) on inputs and outputs.
%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_, Aug 10 2011