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A213057
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Triangle read by rows: left edge is all 1's, right edge is 1, 2, 3, 4, ...; construct an internal entriy by concatenating the two entries above it.
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1
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1, 1, 2, 1, 12, 3, 1, 112, 123, 4, 1, 1112, 112123, 1234, 5, 1, 11112, 1112112123, 1121231234, 12345, 6, 1, 111112, 111121112112123, 11121121231121231234, 112123123412345, 123456, 7, 1, 1111112, 111112111121112112123, 11112111211212311121121231121231234, 11121121231121231234112123123412345, 112123123412345123456, 1234567, 8
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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Closely related to A004073 - see Kubo-Vakil.
After the 9th row of course we will encounter strings like 111...110, which is unsatisfactory. Still, the initial rows look nice and the sequence serves as a pointer to the Kubo-Vakil paper.
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REFERENCES
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T. Kubo and R. Vakil, On Conway's recursive sequence, Discr. Math. 152 (1996), 225-252.
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LINKS
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Table of n, a(n) for n=0..35.
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EXAMPLE
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Triangle begins
1
1 2
1 12 3
1 112 123 4
1 1112 112123 1234 5
1 11112 1112112123 1121231234 12345 6
1 111112 111121112112123 11121121231121231234 112123123412345 123456 7
...
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CROSSREFS
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Cf. A004073, A007318.
Sequence in context: A174500 A211099 A058734 * A103187 A107722 A167128
Adjacent sequences: A213054 A213055 A213056 * A213058 A213059 A213060
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KEYWORD
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nonn,tabl
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AUTHOR
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N. J. A. Sloane, Jun 03 2012
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STATUS
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approved
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