0,3

Binomial transform of octagonal numbers A000567. Inverse binomial transform of A069996.

a(n)=n(3n - 1)2^(n - 2).

O.g.f.: -x*(1+4*x)/(-1+2*x)^3. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008

Sequence in context: A121075 A121073 A163724 this_sequence A126734 A048698 A045770

Adjacent sequences: A084854 A084855 A084856 this_sequence A084858 A084859 A084860

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jun 09 2003