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Search: id:A051391
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| A051391 |
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Number of nonisomorphic Steiner triple systems (STS's) S(2,3,v) on v = 6n+1 or 6n+3 points. |
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+0
1
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OFFSET
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1,5
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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 2 nonisomorphic STS's on 13 points.
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CROSSREFS
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Indexed by A047241. Cf. A001201, A030128, A030129, A051390, A124118, A124119.
Sequence in context: A008563 A059487 A056972 this_sequence A041799 A072408 A123177
Adjacent sequences: A051388 A051389 A051390 this_sequence A051392 A051393 A051394
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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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