A187585 - OEIS

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A187585

Number of Steiner Systems S(2,4,n) with nontrivial automorphism group.

1

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 4466, 0, 0, 0, 0, 0, 0, 0, 0

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OFFSET

1,25

COMMENTS

a(37) is the first unknown value.

LINKS

Table of n, a(n) for n=1..36.

Colin Reid and Alex Rosa, Steiner systems S(2,4,v) - a survey, Electronic Journal of Combinatorics, Dynamic Survey DS18, Feb 01 2010.

E. Spence, The complete classification of Steiner Systems S(2,4,25), J. Combin. Designs, 4 (1996), 295-300.

Index entries for sequences related to Steiner systems

CROSSREFS

Sequence in context: A118067 A037217 A109075 * A228574 A007791 A294699

Adjacent sequences: A187582 A187583 A187584 * A187586 A187587 A187588

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 11 2011

STATUS

approved