5,3

CRC Handbook of Combinatorial Designs, 1996, p. 285.

Sequence in context: A097925 A132195 A076852 this_sequence A093025 A104584 A078575

Adjacent sequences: A011993 A011994 A011995 this_sequence A011997 A011998 A011999

nonn,hard

N. J. A. Sloane (njas(AT)research.att.com).