%I
%S 3,6,6,12,12,6,6,6,6,6,12,12,18,30,30,36,54,66,72,90,96,114,168,210,
%T 252,330,414,486,618,756,888,1200,1494,1776,2232,2796,3456,4362,5454,
%U 6660,8454,10530,12924,16116,20232,25272,31446,39150,48408,60438
%N Number of ternary palindromes of length 2n+1 having no (7/4)+ powers.
%C A (7/4)+ power is a word of the form xx', where x' is a prefix of x and x' > (3/4)x. Every odd length (2n+1) is guaranteed to have at least one such palindrome.
%e For n = 7 there are 6 palindromes of length 15 satisfying the conditions: {010201202102010, 020102101201020, 101210212012101, 121012010210121, 202120121021202, 212021020120212}.
%Y Cf. A279611.
%K nonn
%O 0,1
%A _Jeffrey Shallit_, Dec 16 2016
