13,3
CRC Handbook of Combinatorial Designs, 1996, p. 649.
Sequence in context: A066538 A112305 A114691 * A193506 A086242 A096627
Adjacent sequences: A023636 A023637 A023638 * A023640 A023641 A023642
nonn
N. J. A. Sloane (njas(AT)research.att.com).