4,2
B. Guiduli and Z. Kiraly, On intersecting hypergraphs, Discr. Math., 182 (1998), 139-151.
Cf. A030070.
Sequence in context: A097327 A007272 A061280 * A147653 A152611 A078267
Adjacent sequences: A030068 A030069 A030070 * A030072 A030073 A030074
nonn,frac
N. J. A. Sloane (njas(AT)research.att.com).