Search: id:A047832
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%I A047832
%S A047832 2,36,5600,11220000,293293716992,102484848265030656,
%T A047832 491247277315343649710080,32966971058719932671168222859264,
%U A047832 31464896751148469761776612436741418123264
%N A047832 Number of self-complementary binary relations on a 2n-element set.
%D A047832 Wille D., Enumeration of self-complementary structures, J. Comb. Theory 
               B 25 (1978) 143-150.
%Y A047832 a(n) = A000171(4*n+1).
%Y A047832 Sequence in context: A126934 A001070 A095229 this_sequence A004003 A060739 
               A134366
%Y A047832 Adjacent sequences: A047829 A047830 A047831 this_sequence A047833 A047834 
               A047835
%K A047832 nonn,nice
%O A047832 1,1
%A A047832 Vladeta Jovovic (vladeta(AT)eunet.rs)

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