1,1

All but the first term are even.

Table of n, a(n) for n=1..80.

a(n)= A031368(n+1)-A031368(n).

a(n)= A001223(2n-1)+A001223(2n). - R. J. Mathar, Feb 27 2009

a(n)= A031131(2n-1). - R. J. Mathar, Feb 27 2009

Cf. A110854.

Sequence in context: A113737 A292165 A040006 * A094011 A295558 A295559

Adjacent sequences: A155064 A155065 A155066 * A155068 A155069 A155070

nonn,easy

Paul Curtz, Jan 19 2009

Edited and extended by R. J. Mathar, Feb 27 2009

approved