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A011991 (n,3,1) difference families over Z_n. 0
1, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 4, 0, 7, 0, 0, 0, 12, 0, 8, 0, 0, 0, 80, 0, 84, 0, 0, 0, 820, 0, 798, 0, 0, 0, 9508, 0, 11616, 0, 0, 0, 157340, 0, 139828, 0, 0, 0, 3027456, 0, 2353310 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,9

REFERENCES

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

LINKS

Table of n, a(n) for n=7..57.

CROSSREFS

Sequence in context: A348613 A285182 A190608 * A234931 A129183 A280292

Adjacent sequences: A011988 A011989 A011990 * A011992 A011993 A011994

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 31 15:41 EST 2023. Contains 359976 sequences. (Running on oeis4.)