%I #3 Mar 31 2012 12:35:37
%S 4,15,53,138,483,1678,5634,18915,62325,204315,683210,2277118,7559559,
%T 25132611,83206528,274465209,907716605,3004041236,9908081432
%N Number of 0..3 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 4 of A171307.
%K nonn
%O 1,1
%A _R. H. Hardin_ Dec 06 2009