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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A071757 Expansion of (1+x^4*C^4)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108. 1
1, 4, 14, 48, 166, 580, 2046, 7280, 26104, 94248, 342380, 1250656, 4591122, 16929380, 62678910, 232916400, 868434000, 3247943160, 12181647780, 45807142560, 172664906700, 652291953768, 2469325506252, 9365937951328 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

With[{c=(1-Sqrt[1-4x])/(2x)}, CoefficientList[Series[(1+x^4 c^4)c^4, {x, 0, 30}], x]] (* Harvey P. Dale, Jul 19 2016 *)

CROSSREFS

Sequence in context: A071745 A071749 A071753 * A082590 A085280 A007851

Adjacent sequences:  A071754 A071755 A071756 * A071758 A071759 A071760

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 06 2002

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 17:51 EDT 2019. Contains 321292 sequences. (Running on oeis4.)