%I A006536 M1710
%S A006536 2,6,38,684,50224,13946352,14061131152,50947324188128,
%T A006536 666754350781269760,31763991166456912086656,
%U A006536 5550343429517595744902558208,3581353054755185129132443153728000
%N A006536 Switching classes of digraphs.
%D A006536 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006536 R. C. Read, personal communication.
%Y A006536 Cf. A002854, A049313.
%Y A006536 Sequence in context: A005738 A055704 A005740 this_sequence A057297 A005530 
               A072191
%Y A006536 Adjacent sequences: A006533 A006534 A006535 this_sequence A006537 A006538 
               A006539
%K A006536 nonn,nice
%O A006536 1,1
%A A006536 N. J. A. Sloane (njas(AT)research.att.com).
%E A006536 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 22 2000