21,41
CRC Handbook of Combinatorial Designs, 1996, p. 286.
Sequence in context: A058454 A058472 A058474 this_sequence A002045 A063699 A167165
Adjacent sequences: A010891 A010892 A010893 this_sequence A010895 A010896 A010897
nonn,hard
N. J. A. Sloane (njas(AT)research.att.com).
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