1,3

Table of n, a(n) for n=1..32.

This is the k=1 column (the second column) of the triangle in A217209.

Sequence in context: A077865 A117353 A103422 * A247322 A097281 A321408

Adjacent sequences: A217207 A217208 A217209 * A217211 A217212 A217213

nonn

N. J. A. Sloane, Oct 01 2012

approved