1,1
CRC Handbook of Combinatorial Designs, 1996, p. 315.
Sequence in context: A059160 A028895 A194150 * A048065 A048021 A133268
Adjacent sequences: A010895 A010896 A010897 * A010899 A010900 A010901
nonn,hard
N. J. A. Sloane (njas(AT)research.att.com).