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%I #7 Aug 19 2020 16:44:32
%S 1,3,4,8,12,20,28,40,52,72,96,136,176,228,304,412,532,696,928,1220,
%T 1592,2120,2764,3612,4688,6132,7928,10324,13480,17616,22948,29908,
%U 38964,50748,66184,86344,112364,146344,190500
%N Number of numbers that are ternary squarefree words of length n.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SquarefreeWord.html">Squarefree Word</a>
%F a(n) = A006156(n)*2/3 for n>1 [Corrected by _Rémy Sigrist_, Aug 19 2020].
%Y Cf. A088952, A007089.
%K nonn
%O 0,2
%A _Reinhard Zumkeller_, Oct 25 2003
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