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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A140190 a(n) is the number of groupoids (categories all of whose morphisms are invertible) with m morphisms and m-n objects for any m>=2n. 1
1, 1, 3, 5, 9, 15, 27, 44, 71, 113, 176, 271, 413, 621, 927, 1375, 2004, 2924, 4213 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

Limiting values of A140188, i.e., a(n) = T140188(m,m-n) for any m>=2n.

CROSSREFS

Sequence in context: A018342 A029485 A147087 * A083658 A018436 A018298

Adjacent sequences:  A140187 A140188 A140189 * A140191 A140192 A140193

KEYWORD

nonn

AUTHOR

Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 12 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 18:09 EST 2012. Contains 205663 sequences.