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%I #3 Mar 31 2012 12:35:36
%S 21,441,9239,193017,4046097,84702206,1772179733,37103518720,
%T 776455731351
%N Number of 1..21 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 A171275.
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 06 2009