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%I A000868 M3580 N1451 #25 Feb 12 2015 08:45:54
%S A000868 4,21,1531,44782251,96076794891512491,
%T A000868 886151997189943927518995693301312171,
%U A000868 150770949527755462791108053396729046910357127815416821444325531778055580331
%N A000868 Number of switching networks with C(2,n) acting on domain and GL(2,Z2) acting on range.
%C A000868 Next term has 151 digits. - _Sean A. Irvine_, Jan 23 2012
%D A000868 M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327.
%D A000868 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D A000868 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A000868 Vincenzo Librandi, <a href="/A000868/b000868.txt">Table of n, a(n) for n = 1..10</a>
%H A000868 <a href="/index/Sw#switching">Index entries for sequences related to switching networks</a>
%F A000868 a(n) = (2^(2^(n+1)) + 2^(n+2 + 2^n) - 2^(2^n) + 2^(n+1))/(3*2^(n+1)). - _Sean A. Irvine_, Jan 23 2012
%K A000868 nonn
%O A000868 1,1
%A A000868 _N. J. A. Sloane_
%E A000868 More terms from _Sean A. Irvine_, Jan 22 2012

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