1,3

G.f.: x^2(1+x)(1+x+2x^3)/((1-x)^2*(1+x+x^2+x^3+x^4)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 02 2008]

Sequence in context: A050849 A039008 A161579 this_sequence A064724 A085270 A090908

Adjacent sequences: A047413 A047414 A047415 this_sequence A047417 A047418 A047419

nonn

N. J. A. Sloane (njas(AT)research.att.com).