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A011997 Number of (n,3,7) difference families over Z_n. 0
8, 0, 27, 0, 0, 0, 20347, 0 (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..14.

CROSSREFS

Sequence in context: A337550 A088663 A291681 * A187162 A197618 A340953

Adjacent sequences:  A011994 A011995 A011996 * A011998 A011999 A012000

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 19 18:36 EST 2022. Contains 350466 sequences. (Running on oeis4.)