0,2

a(n)=sum(C(k)*8^k, k=0..n), n>=0, with C(n):=A000108(n).

G.f.: c(8*x)/(1-x), where c(x):=(1-sqrt(1-4*x))/(2*x) is the o.g.f. of Catalan numbers A000108.

Ninth column (m=8) of triangle A112705.

Sequence in context: A156975 A081876 A139760 this_sequence A092652 A137051 A137059

Adjacent sequences: A112699 A112700 A112701 this_sequence A112703 A112704 A112705

nonn,easy

Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Oct 31 2005