1,1
CRC Handbook of Combinatorial Designs, 1996, p. 315.
Sequence in context: A127852 A064027 A028878 * A135446 A160002 A027177
Adjacent sequences: A010893 A010894 A010895 * A010897 A010898 A010899
nonn,hard
N. J. A. Sloane (njas(AT)research.att.com).