0,2

G.f.: 9x(1+36x+81x^2)/(1-9x)^4. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 19 2008]

Cf. A036289; A007758.

Sequence in context: A085530 A158881 A157597 this_sequence A081232 A020548 A091062

Adjacent sequences: A128792 A128793 A128794 this_sequence A128796 A128797 A128798

nonn

Mohammad K. Azarian (azarian(AT)evansville.edu), Apr 07 2007