%I #3 Mar 31 2012 12:35:37
%S 21,440,9178,188356,3959768,83153605,1738979798,36412811648,
%T 761311432412
%N Number of 0..20 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1
%C column 21 of A171307.
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 06 2009