%I M3675 N1498 #17 Feb 01 2022 01:26:47
%S 4,40,3264,45826304,38436615422689280,
%T 118153600037991449448840725115437056,
%U 5743655220104970017628478254229574276569046648639726053254944342556016640
%N Number of n-input 2-output switching networks under action of symmetric group S(n) on the inputs and complementing group C(2,2) on the 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>
%Y Cf. A000612, A000842.
%K nonn
%O 1,1
%A _N. J. A. Sloane_
%E More terms from _Vladeta Jovovic_, Feb 26 2000