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A091782
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a(1) = 1, a(2) = 1, a(3) = a(1) + concatenation a(1), a(2). In general a(n) = a(1) + a(1)a(2)+ a(1)a(2)a(3) + ... + a(1)a(2)...a(n-1), where a(1)a(2)...a(r) is the concatenation of first r terms.
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1
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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a(3) = 1+11 = 12.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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