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, 3, 5, 9, 15, 27, 44, 71, 113, 176, 271, 413, 621, 927, 1375, 2004, 2924, 4213

Offset

0,3

Comments

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

Links

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

Crossrefs

Sequence in context: A029485 A291153 A147087 * A298352 A083658 A018436

Adjacent sequences: A140187 A140188 A140189 * A140191 A140192 A140193

Keyword

nonn

Author

Benoit Jubin, May 12 2008

Status

approved