|
| |
|
|
A030129
|
|
Number of nonisomorphic Steiner triple systems (STS's) S(2,3,n) on n points.
|
|
8
|
|
|
|
1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 80, 0, 0, 0, 11084874829
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,13
|
|
|
REFERENCES
|
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 304.
CRC Handbook of Combinatorial Designs, 1996, p. 70.
|
|
|
LINKS
|
Table of n, a(n) for n=1..19.
P. Kaski and P. R. J. Ostergard (Patric.Ostergard(AT)hut.fi), The Steiner triple systems of order 19
Eric Weisstein's World of Mathematics, Steiner Triple System.
Index entries for sequences related to Steiner systems
|
|
|
CROSSREFS
|
Cf. A001201, A030128, A051390, A124118, A124119.
Sequence in context: A195209 A098276 A215880 * A012647 A012334 A012451
Adjacent sequences: A030126 A030127 A030128 * A030130 A030131 A030132
|
|
|
KEYWORD
|
nonn,nice,hard
|
|
|
AUTHOR
|
Eric W. Weisstein
|
|
|
STATUS
|
approved
|
| |
|
|
