1,1

All terms are even. Do all even numbers (A005843) appear at least once?

Table of n, a(n) for n=1..77.

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

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

Cf. A110854, A155067.

Sequence in context: A183986 A160995 A215454 * A159475 A098350 A276269

Adjacent sequences: A155747 A155748 A155749 * A155751 A155752 A155753

nonn,easy

Paul Curtz, Jan 26 2009

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

approved