1,1

Ray Chandler, Table of n, a(n) for n = 1..10000

a(n) = 2*A020892(n).

Cf. A020892.

Sequence in context: A071830 A276982 A167146 * A090967 A272475 A184016

Adjacent sequences: A020888 A020889 A020890 * A020892 A020893 A020894

nonn

Clark Kimberling

Extended and corrected by David W. Wilson

Offset corrected to 1 by Ray Chandler, Jan 23 2020

approved