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%I #16 Apr 24 2021 03:30:08
%S 0,1,1,2,3,3,3,4,4,5,6,6,7,8,8,8,9,9,9,10,10,11,12,12,12,13,13,14,15,
%T 15,16,17,17,17,18,18,19,20,20,21,22,22,22,23,23,23,24,24,25,26,26,26,
%U 27,27,27,28,28,29,30,30,30,31,31,32,33,33,34,35,35,35,36,36,36,37,37,38,39,39,39,40,40
%N Partial sums of A189673.
%C See A189673.
%H Kevin Ryde, <a href="http://user42.tuxfamily.org/terdragon/index.html">Iterations of the Terdragon Curve</a>, see index "TurnsL", with a(n) = TurnsL(n-1).
%F a(n) = a(floor((n+2)/3)) + floor((n+1)/3), where a(1)=0.
%t (See A189673.)
%o (PARI) a(n) = n--; (n + vecsum(digits(n,3)%2))/2; \\ _Kevin Ryde_, Apr 23 2021
%Y Cf. A189673.
%K nonn
%O 1,4
%A _Clark Kimberling_, Apr 25 2011
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