0,4

O.g.f.: x^2(2x-1)/[(3x^2-3x+1)(3x-1)]. a(n)=6*a(n-1)-12*a(n-2)+9*a(n-3). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008

Cf. A133474.

Sequence in context: A104747 A070050 A027941 this_sequence A000754 A119683 A135373

Adjacent sequences: A135251 A135252 A135253 this_sequence A135255 A135256 A135257

nonn

Paul Curtz (bpcrtz(AT)free.fr), Nov 30 2007

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008