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A124119 Number of nonisomorphic Steiner quadruple systems (SQS's) S(3,4,v) on v = 6n+2 or 6n+4 points. 4
1, 1, 4, 1054163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A051390 is the official version of this sequence and has all the references etc.

LINKS

Table of n, a(n) for n=1..4.

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: A058430 A079286 A275685 * A090096 A218484 A046362

Adjacent sequences:  A124116 A124117 A124118 * A124120 A124121 A124122

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane, Nov 30 2006

STATUS

approved

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Last modified October 22 04:25 EDT 2019. Contains 328315 sequences. (Running on oeis4.)