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Number of nonisomorphic Steiner quadruple systems (SQS's) S(3,4,v) on v = 6n+2 or 6n+4 points.

+0
5

1, 1, 4, 1054163 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A051390 is the official version of this sequence and has all the references etc.`
	LINKS	`Index entries for sequences related to Steiner systems` `Eric Weisstein's World of Mathematics, Steiner Quadruple System`
	EXAMPLE	`There are 4 nonisomorphic SQS's on 14 points.`
	CROSSREFS	`Cf. A124120, A030129, A001201, A030128, A051390.` `Sequence in context: A034209 A058430 A079286 this_sequence A090096 A046362 A144122` `Adjacent sequences: A124116 A124117 A124118 this_sequence A124120 A124121 A124122`
	KEYWORD	`nonn,hard`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2006`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.