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Search: id:A001201
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| A001201 |
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Steiner triple systems (STS's) on 6n+1 or 6n+3 elements.
(Formerly M5214 N2268)
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+0
8
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| 1, 1, 30, 840, 1197504000, 60281712691200, 1348410350618155344199680000
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 304.
CRC Handbook of Combinatorial Designs, 1996, p. 70.
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LINKS
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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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EXAMPLE
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There are 1197504000 STS's on 13 elements.
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CROSSREFS
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Indexed by A047241. Cf. A030128, A030129, A051390.
Sequence in context: A045689 A096722 A049394 this_sequence A007850 A097313 A056389
Adjacent sequences: A001198 A001199 A001200 this_sequence A001202 A001203 A001204
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KEYWORD
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nonn,nice,hard
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AUTHOR
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njas
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