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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 Table of n, a(n) for n=0..18. 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 Cf. A001200, A031437, A031438, A001439, A056642. Sequence in context: A077505 A309376 A247382 * A144556 A001439 A318215 Adjacent sequences: A031433 A031434 A031435 * A031437 A031438 A031439 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 December 5 21:07 EST 2023. Contains 367594 sequences. (Running on oeis4.)