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A355851
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The difference between the indices of the two most recent instances of a(n-1), not including a(n-1) itself, or 0 if not enough such instances exist.
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0
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0, 0, 0, 1, 0, 1, 0, 2, 0, 2, 0, 2, 2, 2, 1, 2, 1, 9, 0, 2, 2, 4, 0, 8, 0, 4, 0, 2, 1, 2, 7, 0, 2, 2, 3, 0, 5, 0, 4, 4, 13, 0, 2, 1, 12, 0, 4, 1, 15, 0, 4, 7, 0, 4, 4, 3, 0, 3, 21, 0, 4, 1, 4, 6, 0, 3, 2, 9, 0, 5, 0, 4, 2, 24, 0, 2, 6, 0, 4, 9, 50, 0, 3, 8, 0, 4, 7, 21, 0, 3, 17
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OFFSET
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1,8
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COMMENTS
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This is similar to Van Eck's sequence: A181391.
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LINKS
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EXAMPLE
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Say you have 0, 0, 0, 1, 0, 1, 0, 2, 0, 2, 0, 2, 2, ?
The previous term is a 2, and the distance between the pair of most recent 2s before that is 2, hence ? = 2.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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