A187567 Number of Steiner Systems S(2,4,n).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 18, 0, 0

Offset

1,25

Comments

S(2,4,n) exists if and only if n == 1 or 4 (mod 12).

a(28) >= 4653.

Links

Table of n, a(n) for n=1..27.

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. A187585, A001201, A030129.

Sequence in context: A257377 A246649 A210709 * A160145 A072839 A156400

Adjacent sequences: A187564 A187565 A187566 * A187568 A187569 A187570

Keyword

nonn,more

Author

N. J. A. Sloane, Mar 11 2011

Status

approved