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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A116870 Seventh column of triangle A028364. 0
429, 1001, 3003, 9646, 32123, 109550, 380162, 1337220, 4755402, 17065365, 61714147, 224661206, 822574599, 3027096930, 11190101910, 41532876060, 154712622870, 578210935770, 2167431271614, 8146882131276 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Also seventh diagonal of triangle A067323.

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n)= A028364(n+6,6) = sum(C(k)*C(n+6-k),k=0..6), with the Catalan numbers C(n):=A000108(n).

G.f.: (c6(x)*c(x)-(c6(x)-1)/x)/x^6, with c6(x) := sum(C(k)*x^k, k=0..6) and c(x) is the g.f. for the Catalan numbers A000108.

CROSSREFS

Cf. A116869 (sixth column).

Sequence in context: A177328 A203612 A034278 * A064061 A115133 A090200

Adjacent sequences:  A116867 A116868 A116869 * A116871 A116872 A116873

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Mar 24 2006

STATUS

approved

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 May 22 19:51 EDT 2013. Contains 225568 sequences.