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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234269 G.f.: (1-2*x^2-sqrt(1-4*x^2-4*x^3))/(2*x*sqrt(1-4*x^2-4*x^3)). 2
0, 0, 1, 1, 4, 7, 18, 39, 90, 206, 470, 1085, 2492, 5762, 13314, 30849, 71556, 166210, 386562, 899976, 2097524, 4892966, 11423984, 26693381, 62417940, 146053272, 341970538, 801168316, 1878016792, 4404544926, 10335098184, 24262063281, 56980852484, 133877548896 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

J.-L. Baril, J.-M. Pallo, Motzkin subposet and Motzkin geodesics in Tamari lattices, 2013

CROSSREFS

Cf. A234270.

Sequence in context: A289975 A124400 A077920 * A135582 A100828 A267488

Adjacent sequences:  A234266 A234267 A234268 * A234270 A234271 A234272

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 24 2013

EXTENSIONS

Offset changed to 0 and more terms from Alois P. Heinz, Nov 16 2015

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 18 19:58 EDT 2019. Contains 321293 sequences. (Running on oeis4.)