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A030129
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Number of nonisomorphic Steiner triple systems (STS's) S(2,3,n) on n points.
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8
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1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 80, 0, 0, 0, 11084874829
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,13
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REFERENCES
| L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 304.
CRC Handbook of Combinatorial Designs, 1996, p. 70.
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LINKS
| 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, Link to a section of The World of Mathematics.
Index entries for sequences related to Steiner systems
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CROSSREFS
| Cf. A001201, A030128, A051390, A124118, A124119.
Sequence in context: A012694 A195209 A098276 * A012647 A012334 A012451
Adjacent sequences: A030126 A030127 A030128 * A030130 A030131 A030132
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KEYWORD
| nonn,nice,hard
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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