1,1

CRC Handbook of Combinatorial Designs, 1996, p. 315.

Sequence in context: A063233 A063147 A031014 this_sequence A090381 A106398 A054567

Adjacent sequences: A010896 A010897 A010898 this_sequence A010900 A010901 A010902

nonn,hard

N. J. A. Sloane (njas(AT)research.att.com).