0,2

a(n)=sum(C(k)*6^k, k=0..n), n>=0, with C(n):=A000108(n).

G.f.: c(6*x)/(1-x), where c(x):=(1-sqrt(1-4*x))/(2*x) is the o.g.f. of Catalan numbers A000108.

Seventh column (m=6) of triangle A112705.

Sequence in context: A127890 A127859 A014293 this_sequence A098105 A159524 A113034

Adjacent sequences: A112697 A112698 A112699 this_sequence A112701 A112702 A112703

nonn,easy

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