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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.

A140468 Number of 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 7
4 9
5 13
6 25
7 97
8 1741
9 719725

List of values

[4, 6, 7, 9, 13, 25, 97, 1741, 719725]

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

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