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A069054
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a(1)=0 a(2)=1 a(n)=concatenate(a(n-1)a(n-2)...a(1))-a(n-1).
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0
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0, 1, 9, 901, 901009, 901009000901, 901009000901000000901009, 901009000901000000901009000000000000901009000901, 901009000901000000901009000000000000901009000901000000000000000000000000901009000901000000901009
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