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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.

A006247 Number of simple arrangements of n pseudolines in the projective plane with a marked cell. Number of Euclidean pseudo-order types: nondegenerate abstract order types of configurations of n points in the plane.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 3
6 16
7 135
8 3315
9 158830
10 14320182
11 2343203071
12 691470685682
13 366477801792538

List of values

[1, 1, 1, 2, 3, 16, 135, 3315, 158830, 14320182, 2343203071, 691470685682, 366477801792538]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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