1,2
Comtet, L.; Birecouvrements et birevetements d'un ensemble fini. Studia Sci. Math. Hungar. 3 1968 137-152.
Sequence in context: A129043 A135746 A006057 this_sequence A020554 A062874 A062873
Adjacent sequences: A002716 A002717 A002718 this_sequence A002720 A002721 A002722
dead
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