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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A140186 Number of connected groupoids (categories all of whose morphisms are invertible) with n more morphisms than objects. 2
2, 1, 2, 2, 1, 2, 3, 5, 2, 2, 2, 5, 2, 2, 3, 15, 1, 5, 2, 5, 3, 2, 3, 15, 3, 2, 6, 4, 2, 4, 7, 51, 1, 4, 3, 14, 1, 2, 4, 14, 1, 6, 4, 4, 3, 3, 6, 52, 2, 5, 2, 7, 1, 15, 4, 13, 3, 2, 2, 13, 4, 2, 18, 267, 1, 4, 3, 5, 1, 9, 7, 50, 2, 2, 4, 4, 2, 6, 8, 52, 15, 2, 3, 15, 1, 2, 3, 14, 1, 10, 3, 5, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) >= A000001(n+1) (number of groups of order n+1).

LINKS

Table of n, a(n) for n=0..92.

FORMULA

a(0) = 2 and if n>0, a(n) = sum(A000001((n+k)/(k^2)),k^2|n+k). (see formula for A140185)

CROSSREFS

Cf. A140185, A140187, A140188.

Sequence in context: A132749 A271106 A273673 * A078498 A178522 A131240

Adjacent sequences:  A140183 A140184 A140185 * A140187 A140188 A140189

KEYWORD

nonn

AUTHOR

Benoit Jubin, May 12 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 December 10 23:29 EST 2019. Contains 329910 sequences. (Running on oeis4.)