cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A018242 Number of projective order types.

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 4, 11, 135, 4381, 312114, 41693377
Offset: 0

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Comments

Table 5.6.1 in the Felsner-Goodman survey contains this sequence in the second row, but the line is incorrectly labeled. The origin of these data is the paper of Aichholzer and Krasser. - Günter Rote, Apr 16 2025

Crossrefs

Cf. A006247, A006248, A063666. A diagonal of A222317.

Formula

Asymptotics: a(n) = 2^(Theta(n log n)). This is Bachmann-Landau notation, that is, there are constants n_0, c, and d, such that for every n >= n_0 the inequality 2^(c n log n) <= a(n) <= 2^(d n log n) is satisfied. For more information see e.g. the Handbook of Discrete and Computational Geometry. - Manfred Scheucher, Sep 12 2019

Extensions

a(11) from Franz Aurenhammer (auren(AT)igi.tu-graz.ac.at), Feb 05 2002
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