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A011993 (2n+1,3,3) difference families over Z_{2n+1}. 0
1, 3, 4, 8, 47, 421, 1550, 13316, 212968 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

REFERENCES

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

CROSSREFS

Sequence in context: A119529 A180629 A096847 * A180169 A154714 A001695

Adjacent sequences:  A011990 A011991 A011992 * A011994 A011995 A011996

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.