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A031436 Number of proper linear spaces of order n. 4
1, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 3, 7, 1, 119, 398, 161925, 2412890 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,13
LINKS
Anton Betten and Dieter Betten, The proper linear spaces on 17 points, Discrete Applied Mathematics, Volume 95, no. 1-3, 1999, pp. 83-108.
Anton Betten and Dieter Betten, Note on the Proper Linear Spaces on 18 Points, in "Algebraic Combinatorics and Applications", Springer 2001, pp. 40-54.
Anton Betten and Dieter Betten, Data up to 18 points, Proceedings of ALCOMA 1999, Springer Verlag 2000, 40-54 [free access].
Hans-Dietrich O. F. Gronau, Ronald C. Mullin, Christian Pietsch, Pairwise Balanced Designs as Linear Spaces, pp. 228-235, table 4.19 [but beware errors], in: Charles J. Colbourn, Ed., CRC Handbook of Combinatorial Designs, CRC Press, Boca Raton 1996 [PDF preview]
CROSSREFS
Sequence in context: A077505 A309376 A247382 * A144556 A001439 A318215
KEYWORD
nonn,nice,hard,more
AUTHOR
Anton Betten (Anton.Betten(AT)uni-bayreuth.de)
EXTENSIONS
Additional comments from Michael Somos, Nov 18 2001
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)