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A030128
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Steiner triple systems (STS's) on n elements.
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6
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1, 0, 1, 0, 0, 0, 30, 0, 840, 0, 0, 0, 1197504000, 0, 60281712691200, 0, 0, 0, 1348410350618155344199680000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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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. \"Osterg{\aa}rd (Patric.Ostergard(AT)hut.fi), The Steiner triple systems of order 19
Index entries for sequences related to Steiner systems
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CROSSREFS
| Cf. A001201, A030129, A051390.
Sequence in context: A023926 A022068 A198805 * A137348 A137737 A062513
Adjacent sequences: A030125 A030126 A030127 * A030129 A030130 A030131
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KEYWORD
| nonn,nice,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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