0, 1, 3, 10, 30, 100, 300, 1000, 3000, 10000, 30000, 100000, 300000, 1000000, 3000000, 10000000, 30000000,
...
linear recurrence: a(n) = 10*a(n-2) for n >=3, and a(1)=0, a(2)=1, a(3)=3, a(4)=10, a(5)=30, a(6)=100,
What is the o.g.f?
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