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A011999 (2n+1,3,9) difference families over Z_{2n+1}. 0
1, 12, 108, 2593, 225900 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

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

LINKS

Table of n, a(n) for n=2..6.

CROSSREFS

Sequence in context: A225779 A289291 A138432 * A128877 A085797 A016161

Adjacent sequences:  A011996 A011997 A011998 * A012000 A012001 A012002

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)