1,1
CRC Handbook of Combinatorial Designs, 1996, p. 315.
Sequence in context: A008074 A008190 A008193 * A009904 A008215 A008232
Adjacent sequences: A010894 A010895 A010896 * A010898 A010899 A010900
nonn,hard
N. J. A. Sloane (njas(AT)research.att.com).