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%I #6 Mar 18 2021 23:29:08
%S 0,0,1,0,2,8,24,70,214,638,1930,5782,17394,52160,156620,469786,
%T 1409786,4229148,12688720,38065506,114200378,342599212,1027809200,
%U 3083421770,9250300098,27750882922,83252753086,249758206958,749274934114,2247824645796,6743474876960
%N Number of ternary words of length n (beginning 0) with autocorrelation function 2^(n-1)+3.
%F a(2*n) = 3*a(2*n-1) + 2*a(n) - a(n+1) for n>=3; a(2*n-1) = 3*a(2*n-2) + 2*a(n) for n>=3.
%K nonn
%O 1,5
%A TORSTEN.SILLKE(AT)LHSYSTEMS.COM
%E More terms from _Sean A. Irvine_, Mar 18 2021
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