A187585 Number of Steiner Systems S(2,4,n) with nontrivial automorphism group.

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

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

Cf. A187567.

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