1,2
a(n)=a(n-3)+6. G.f.: x(1+3x+x^2+x^3)/((1-x)^2*(1+x+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 21 2009]
Sequence in context: A035266 A035264 A153085 this_sequence A039577 A013951 A013947
Adjacent sequences: A047256 A047257 A047258 this_sequence A047260 A047261 A047262
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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