2,2

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

Sequence in context: A155701 A119529 A096847 this_sequence A154714 A001695 A019676

Adjacent sequences: A011990 A011991 A011992 this_sequence A011994 A011995 A011996

nonn,hard

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