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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.

A244020 Number of new points at the n-th step of the following iteration, starting with four points in general position in the real projective plane: dualize the current pointset to a family of lines, take all intersections of those lines, repeat.

Table of values

n a(n)
1 4
2 6
3 3
4 3
5 6
6 16
7 84
8 1716
9 719628

List of values

[4, 6, 3, 3, 6, 16, 84, 1716, 719628]

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