1,2

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.

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).

Sequence in context: A334700 A007207 A302799 * A038328 A126860 A010203

Adjacent sequences: A213056 A213057 A213058 * A213060 A213061 A213062

nonn

N. J. A. Sloane, Jun 03 2012

approved