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A171878
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a(n) = a(n-1) + a(n-2)*a(n-3) + a(n-4)^a(n-5)
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0
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0, 0, 0, 0, 1, 2, 3, 6, 13, 33, 120, 765, 4831534, 55040353993453427047, 410186270246002225336426103593500672000000000000055040353997149550557
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