1,1
CRC Handbook of Combinatorial Designs, 1996, p. 315.
Sequence in context: A106675 A022946 A184428 * A045376 A045377 A180470
Adjacent sequences: A010892 A010893 A010894 * A010896 A010897 A010898
nonn,hard
N. J. A. Sloane (njas(AT)research.att.com).