login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A291887 Number of symmetrically unique Dyck paths of semilength n and height three. 2
1, 3, 11, 31, 91, 250, 690, 1863, 5017, 13389, 35621, 94354, 249352, 657421, 1730685, 4550031, 11950963, 31365810, 82274126, 215711947, 565376593, 1481448697, 3881041065, 10165822434, 26624745964, 69725071281, 182583838181, 478093234315, 1251829592839 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,2
LINKS
FORMULA
G.f.: -x^3*(x^4+2*x^2-3*x+1)/((2*x-1)*(x^2-3*x+1)*(2*x^2-1)*(x^2+x-1)).
CROSSREFS
Column k=3 of A291883.
Sequence in context: A320238 A369399 A108898 * A217323 A263781 A119901
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Sep 05 2017
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 16 10:23 EDT 2024. Contains 371699 sequences. (Running on oeis4.)