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%I #14 Jan 01 2019 07:25:52
%S 1,1,0,0,0,0,0,1,0,1,1,1,3,7,1,119,398,161925,2412890
%N Number of proper linear spaces of order n.
%H Anton Betten and Dieter Betten, <a href="https://www.math.colostate.edu//~betten/pub/betten15.pdf">The proper linear spaces on 17 points</a>, Discrete Applied Mathematics, Volume 95, no. 1-3, 1999, pp. 83-108.
%H Anton Betten and Dieter Betten, <a href="https://doi.org/10.1007/978-3-642-59448-9_2">Note on the Proper Linear Spaces on 18 Points</a>, in "Algebraic Combinatorics and Applications", Springer 2001, pp. 40-54.
%H Anton Betten and Dieter Betten, <a href="http://www.math.colostate.edu/~betten/pub/betten24.pdf">Data up to 18 points</a>, Proceedings of ALCOMA 1999, Springer Verlag 2000, 40-54 [free access].
%H 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., <a href="https://www.taylorfrancis.com/books/9781420049954">CRC Handbook of Combinatorial Designs</a>, CRC Press, Boca Raton 1996 [PDF preview]
%Y Cf. A001200, A031437, A031438, A001439, A056642.
%K nonn,nice,hard,more
%O 0,13
%A Anton Betten (Anton.Betten(AT)uni-bayreuth.de)
%E Additional comments from _Michael Somos_, Nov 18 2001
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