unlabeled analog of A049056?

[Detlef Pauly]

SeqFans,

is the unlabeled analog of A049056 known?

http://www.research.att.com/projects/OEIS?Anum=A049056
%N A049056 Number of minimal ordered covers of a
labeled n-set.
%D A049056 R. J. Clarke, Covering a set by subsets,
Discrete Math., 81 (1990), 147-152.

Best regards,

Det



	

	
		
___________________________________________________________ 
Gesendet von Yahoo! Mail - Jetzt mit 250MB Speicher kostenlos - Hier anmelden: http://mail.yahoo.de