1,20

R. H. Hardin, Table of n, a(n) for n=1..1000

Cf. A001405.

Sequence in context: A074944 A245041 A161315 * A161034 A161085 A161301

Adjacent sequences: A161246 A161247 A161248 * A161250 A161251 A161252

nonn

R. H. Hardin, Jun 06 2009

approved