1,2

Central terms of the triangle in A118413.

a(n) = A016813(n-1)*A000079(n-1).

O.g.f.: x*(1+6*x)/(-1+2*x)^2 . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 26 2008

Cf. A058962.

Sequence in context: A033585 A118629 A050509 this_sequence A051959 A117327 A117404

Adjacent sequences: A118412 A118413 A118414 this_sequence A118416 A118417 A118418

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 27 2006

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 26 2008