4,2
B. Guiduli and Z. Kiraly, On intersecting hypergraphs, Discr. Math., 182 (1998), 139-151.
Cf. A030071.
Sequence in context: A062546 A019880 A021518 * A154900 A172197 A016630
Adjacent sequences: A030067 A030068 A030069 * A030071 A030072 A030073
nonn,frac
N. J. A. Sloane (njas(AT)research.att.com).