0,2

Row sums of A128208.

Essentially the same as A052953. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 14 2008

G.f.:(1-3x^2)/(1-2x-x^2+2x^3); a(n)=1+2^n/3-(-1)^n/3;

Sequence in context: A063886 A003000 A122536 this_sequence A052953 A074028 A061894

Adjacent sequences: A128206 A128207 A128208 this_sequence A128210 A128211 A128212

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Feb 19 2007