A124119 Number of nonisomorphic Steiner quadruple systems (SQS's) S(3,4,v) on v = 6n+2 or 6n+4 points.

1, 1, 4, 1054163

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.

Eric Weisstein's World of Mathematics, Steiner Quadruple System

Index entries for sequences related to Steiner systems

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,more

Author

N. J. A. Sloane, Nov 30 2006

Status

approved