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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
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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 March 28 13:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)