1,2

A091891(a(n)) = 1.

Table of n, a(n) for n=1..39.

Cf. A018819, A091889, A091890, A000120, A000041.

Sequence in context: A036991 A165887 A316625 * A292939 A232011 A153183

Adjacent sequences: A091889 A091890 A091891 * A091893 A091894 A091895

nonn

Reinhard Zumkeller, Feb 10 2004

approved