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%I M4731 N2023 #20 Mar 04 2015 20:54:30
%S 10,88,6616,91666432,76873231310808704,
%T 236307200075982899871259747594698752,
%U 11487310440209940035256956508459148560969989043872580978940882909553754112,166267459448692920381622333807116147427859895760062485070882091322892520958706179582178218311954136674872641052328937320550635171107567787263574147072
%N Number of switching networks (see Harrison reference for precise definition).
%C Number of equivalence classes with symmetric group of n variables operating on the domain and symmetric group of 2 variables operating on the range. - _Sean A. Irvine_, Jul 11 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 10 2011
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