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A011992 (n,3,2) difference families over Z_n. 0
2, 0, 0, 0, 0, 4, 9, 0, 9, 71, 0, 0, 201, 0, 175, 0, 0, 2939, 19543, 0, 10841, 609483 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

REFERENCES

CRC Handbook of Combinatorial Designs, 1996, p. 285.

LINKS

Table of n, a(n) for n=7..28.

CROSSREFS

Sequence in context: A028617 A261470 A006792 * A318329 A107503 A350731

Adjacent sequences: A011989 A011990 A011991 * A011993 A011994 A011995

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 28 03:39 EST 2022. Contains 358406 sequences. (Running on oeis4.)