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0, 0, 0, 0, 1, 1, 2, 3, 5, 7, 10, 13, 18, 24, 32, 40, 51, 66, 83, 103, 128, 158, 194, 237, 288, 348, 419, 500, 612
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,7
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LINKS
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EXAMPLE
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a(7)=2 because there are two different values. ( 10 and 6 ):
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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