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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A054768 a[n+2] = (2n+3) a[n+1] + (n+1)^2 a[n]. 0
-2, 1, 1, 9, 72, 792, 10512, 165168, 2992608, 61445088, 1409857920, 35751525120, 992877886080, 29970166769280, 976990865518080, 34206887786803200, 1280236466132467200, 51004766655793036800, 2155155171665039308800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..18.

K. S. Brown, Integer Sequences Related To PI

CROSSREFS

Sequence in context: A283321 A155718 A256168 * A104251 A153731 A262226

Adjacent sequences:  A054765 A054766 A054767 * A054769 A054770 A054771

KEYWORD

sign,easy

AUTHOR

N. J. A. Sloane, May 26 2000

EXTENSIONS

More terms from James A. Sellers, May 27 2000

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 12 16:38 EST 2017. Contains 295949 sequences.