A067300 One third of third column of triangle A067298.

3, 12, 100, 1024, 11632, 140864, 1782080, 23273984, 311407360, 4246776832, 58812433408, 824868814848, 11692779565056, 167254617440256, 2411126992093184, 34994856661483520, 510941885186637824

Offset

0,1

Links

Table of n, a(n) for n=0..16.

Formula

a(n)=A067298(n+2, 2)/3.

G.f.: ((1-4*x)*c(4*x)+2)/(1-2*x*c(4*x))^2, with c(x) is g.f. for A000108 (Catalan).

Crossrefs

Cf. A067299 (second column), 8*A067301 (fourth column).

Sequence in context: A115245 A145074 A162055 * A133359 A102687 A202302

Adjacent sequences: A067297 A067298 A067299 * A067301 A067302 A067303

Keyword

nonn,easy

Author

Wolfdieter Lang, Feb 05 2002

Status

approved