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%I #3 Mar 30 2012 18:51:53
%S 0,1,3,6,9,15,18,27,27,36,27,27,0,-27,-81,-162,-243,-405,-486,-729,
%T -729,-972,-729,-729,0,729,2187,4374
%N a(2n+1) = 3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2) = 3a(2n+1)-3a(2n), a(0) = 0, a(1) = 1, a(2) = 3.
%K sign
%O 0,3
%A _Paul Curtz_, Oct 19 2007
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