%I
%S 0,1,1,2,1,7,4,17,29,46,121,243,408,833,1929,3658,6353,12815,30844,
%T 61009,100133,216534,514233,930107,1686288,3352737,8264081,15163506,
%U 27077825,53153175,133991380,243114769,428343405,854649182,2120804377,3870970883,6937439304
%N a(n) = a(n1) XOR (a(n2)*3).
%H Ivan Panchenko, <a href="/A204771/b204771.txt">Table of n, a(n) for n = 0..200</a>
%F a(0)=0, a(1)=1, a(n) = a(n1) XOR (a(n2)*3), where XOR is the bitwise exclusiveOR operator.
%o (Python)
%o prpr = 0
%o prev = 1
%o for i in range(99):
%o current = (prev)^(prpr*3)
%o print(prpr, end=',')
%o prpr = prev
%o prev = current
%Y Cf. A101624: a(n) = a(n1) XOR (a(n2)*2).
%Y Cf. A101625: a(n) = a(n1) XOR (a(n2)*4).
%K nonn,base,easy
%O 0,4
%A _Alex Ratushnyak_, May 07 2012
