login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A143991 Numerators of numbers with g.f. exp(1-(1-x)^(1/2)). 3
1, 1, 1, 7, 37, 133, 2431, 27007, 176761, 5329837, 12994393, 866792053, 5213746711, 841146804577, 10532583170701, 569600638022431, 16539483668991901, 3333075288160853, 16955228098102446847, 932411737877492011, 10996483739066355827053, 66024590609554132070857 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

EXAMPLE

1, 1/2, 1/4, 7/48, 37/384, 133/1920, 2431/46080, 27007/645120, 176761/5160960, ...

CROSSREFS

Cf. A143968, A001515.

Sequence in context: A139891 A082113 A196597 * A243893 A012885 A162541

Adjacent sequences:  A143988 A143989 A143990 * A143992 A143993 A143994

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Dec 02 2008

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 November 26 03:20 EST 2020. Contains 338632 sequences. (Running on oeis4.)