login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067300 One third of third column of triangle A067298. 3
3, 12, 100, 1024, 11632, 140864, 1782080, 23273984, 311407360, 4246776832, 58812433408, 824868814848, 11692779565056, 167254617440256, 2411126992093184, 34994856661483520, 510941885186637824 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

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 (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 05 2002

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 11:25 EST 2012. Contains 205777 sequences.