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%I #4 Mar 31 2012 12:36:19
%S 1,2,2,0,0,36,144,672,0,688,161420,1568320,16640624,234147048,
%T 2955532608,39844932096
%N Number of permutations of 0..(n-1) with equal numbers of bit changes for every bit in the binary representation of the permutation
%e Some solutions for n=6 (in binary)
%e ..100.101.011.100.010.010.011.010.011.011.010.100.011.010.100.101
%e ..010.011.101.010.000.000.000.001.000.001.100.001.101.001.010.011
%e ..101.000.010.001.001.011.001.000.101.010.011.010.010.100.001.100
%e ..000.100.001.101.100.100.101.100.001.101.001.000.000.000.000.000
%e ..001.001.000.000.011.001.010.011.010.000.000.101.001.011.101.001
%e ..011.010.100.011.101.101.100.101.100.100.101.011.100.101.011.010
%K nonn
%O 1,2
%A _R. H. Hardin_ May 09 2011
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