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1, 2, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 2
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| (1) Does every row occur infinitely many times as a segment of A000002?
(2) In Kolakoski's note, the initial 1 appears at the bottom, centered,
with 2 just above and successive rows arise as branches so that the
array resembles a handheld fan.
Arises from the Kolakoski sequence, K(n)=A000002(n), as follows:
row 1: 1
row 2: 2
row 3: 2 2
row 4: 1 1 2 2
row 5: 1 2 1 1 2 2,
and so on, where the first term in row n is K(n) and row n-1 tells how many of each kind (1 or 2) to write in row n.
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REFERENCES
| William G. Kolakoski, unpublished note entitled "Kolakoski Series Fan," dated Nov 12, 1993.
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LINKS
| Wikipedia, Kolakoski sequence
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EXAMPLE
| Row 4 (1,1,2,2) determines row 5: (one 1, one 2, two 1's, two 2's).
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CROSSREFS
| Cf. A000002.
Sequence in context: A062246 A037811 A091237 * A190321 A134143 A085684
Adjacent sequences: A143474 A143475 A143476 * A143478 A143479 A143480
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KEYWORD
| nonn,tabl
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu), Aug 19 2008, Aug 25 2008
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