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A015489
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a(0)=1, a(1)=4, a(n) = sum_{k=0}^{k=n-1} 4^k a(k).
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0
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1, 4, 17, 289, 18785, 4827745, 4948438625, 20273753046625, 332185443668950625, 21770437421732017110625, 5707011317919939625464790625, 5984240806710536532650993759190625
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