7,1

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

Sequence in context: A021669 A011511 A020856 this_sequence A076266 A016581 A099220

Adjacent sequences: A011992 A011993 A011994 this_sequence A011996 A011997 A011998

nonn,hard

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