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A013576
Minimal scope of an (n,4) difference triangle.
1
11, 22, 32, 41, 51, 60, 71, 80, 91, 100, 111, 120, 131, 140, 151
OFFSET
1,1
REFERENCES
CRC Handbook of Combinatorial Designs, 1996, p. 315.
CROSSREFS
Sequence in context: A054728 A374365 A178897 * A065998 A364275 A351877
KEYWORD
nonn,hard
AUTHOR
STATUS
approved