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!)
A160622 Denominator of Laguerre(n, 1). 2
1, 1, 2, 3, 8, 15, 144, 420, 5760, 4536, 403200, 1995840, 6220800, 259459200, 1341204480, 46702656000, 1394852659200, 11115232128000, 376610217984000, 96543730483200, 128047474114560000, 1277273554292736000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
Denominators of coefficients in expansion of exp(-x/(1 - x))/(1 - x). - Ilya Gutkovskiy, Aug 29 2018
EXAMPLE
1, 0, -1/2, -2/3, -5/8, -7/15, -37/144, -17/420, 887/5760, 1405/4536, 168919/403200, 958271/1995840, ... = A160621/A160622.
MATHEMATICA
Denominator[Table[LaguerreL[n, 1], {n, 0, 50}]] (* G. C. Greubel, May 06 2018 *)
PROG
(PARI) for(n=0, 30, print1(denominator(sum(k=0, n, binomial(n, k)*((-1)^k/k!))), ", ")) \\ G. C. Greubel, May 06 2018
(Magma) [Denominator((&+[Binomial(n, k)*((-1)^k/Factorial(k)): k in [0..n]])): n in [0..30]]; // G. C. Greubel, May 06 2018
CROSSREFS
For numerators see A160621.
Cf. A009940.
Sequence in context: A129108 A230284 A264235 * A153699 A182670 A234696
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Nov 14 2009
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 22 22:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)