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A039990
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k th digit of a(n) is the number of different digits within 4 of k (not including k).
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0
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111, 122, 212, 221, 1111, 1222, 2122, 2212, 2221, 11111, 12222, 21222, 22122, 22212, 22221, 111111, 122221, 212222, 221222, 222122, 222212
(list; graph; refs; listen; history; internal format)
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