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

Author

N. J. A. Sloane, Mar 11 2011

Keywords

• nonn
• more

Comments

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

a(28) >= 4653.

Links

• 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.