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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

%I #2 Mar 31 2012 10:31:22

%S 1,1,3,5,9,15,27,44,71,113,176,271,413,621,927,1375,2004,2924,4213

%N 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.

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

%K nonn

%O 0,3

%A _Benoit Jubin_, May 12 2008