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A213059 Subsets of positive integers arranged in canonical order. 0
1, 12, 2, 123, 13, 23, 3, 1234, 124, 134, 234, 14, 24, 34, 4, 12345, 1235, 1245, 1345, 2345, 125, 135, 145, 235, 345, 345, 15, 25, 35, 45, 5, 123456, 12346, 12356, 12456, 13456, 23456, 1236, 1246, 1256, 1346, 1356, 1456, 2346, 2356, 2456, 3456, 126, 136, 146, 156, 236, 246, 256, 346, 356, 456, 16, 26, 36, 46, 56, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The order is self-explanatory (or see the Kubo-Vakil paper).

Of course once we reach subsets containing 10 this way of representing subsets by concatenation is unsatisfactory. Still, the sequence serves as a pointer to the Kubo-Vakil paper.

LINKS

Table of n, a(n) for n=1..63.

T. Kubo and R. Vakil, On Conway's recursive sequence, Discr. Math. 152 (1996), 225-252. a(n) is the concatenation of their S(n).

CROSSREFS

Sequence in context: A334700 A007207 A302799 * A038328 A126860 A010203

Adjacent sequences:  A213056 A213057 A213058 * A213060 A213061 A213062

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 03 2012

STATUS

approved

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Last modified August 11 08:50 EDT 2020. Contains 336422 sequences. (Running on oeis4.)