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A187567 Number of Steiner Systems S(2,4,n). 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, 18, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,25

COMMENTS

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

a(28) is >= 4653.

REFERENCES

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.

LINKS

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

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

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Last modified December 13 00:17 EST 2017. Contains 295954 sequences.