%I #6 Nov 25 2018 13:50:32
%S 0,0,0,1,1,4,6,7,7,14,20,25,27,30,36,37,37,52,66,79,89,100,112,117,
%T 115,122,140,153,157,158,168,167,167,198,228,257,283,310,338,359,373,
%U 396,428,453,467,474,486,491,481,496,538,575,603,628,654,665,653,650,680,707,711
%N a(n) = n(n+1)/2 - A169780(n).
%C If n is a power of 2, this is the number of OFF cells after n stages in a 60-degree wedge of the hexagonal CA (see A170905, A169780, A151723, A169789).
%H N. J. A. Sloane, <a href="/A169788/b169788.txt">Table of n, a(n) for n = 0..1025</a>
%Y Cf. A170905, A169780, A151723, A169789.
%K nonn
%O 0,6
%A _N. J. A. Sloane_, May 13 2010