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A011999
(2n+1,3,9) difference families over Z_{2n+1}.
0
1, 12, 108, 2593, 225900
OFFSET
2,2
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 285.
CROSSREFS
Sequence in context: A225779 A289291 A138432 * A128877 A085797 A016161
KEYWORD
nonn,hard
AUTHOR
STATUS
approved