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a(3n)=a(n), a(3n+1)=a(3n)+a(3(n+1)), a(3n+2)=a(3n)-a(3(n+1)); a(0)=0, a(1)=1.
1

%I #7 Apr 07 2016 02:40:59

%S 0,1,-1,1,0,2,-1,0,-2,1,1,1,0,2,-2,2,1,3,-1,-1,-1,0,-2,2,-2,-1,-3,1,2,

%T 0,1,2,0,1,1,1,0,2,-2,2,0,4,-2,0,-4,2,3,1,1,4,-2,3,2,4,-1,-2,0,-1,-2,

%U 0,-1,-1,-1,0,-2,2,-2,0,-4,2,0,4,-2,-3,-1,-1,-4,2,-3,-2,-4,1

%N a(3n)=a(n), a(3n+1)=a(3n)+a(3(n+1)), a(3n+2)=a(3n)-a(3(n+1)); a(0)=0, a(1)=1.

%C Maxima a(<3^n)=A029744(n).

%H Max Barrentine, <a href="/A270658/b270658.txt">Table of n, a(n) for n = 0..59048</a>

%F a(3n)=a(n), a(3n+1)=a(3n)+a(3(n+1)), a(3n+2)=a(3n)-a(3(n+1)); a(0)=0, a(1)=1.

%K sign,look

%O 0,6

%A _Max Barrentine_, Mar 21 2016

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