A011991 - OEIS

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A011991

(n,3,1) difference families over Z_n.

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.)