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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.

A288565 Number of connected one-sided arrangements of n pseudo-circles in the affine plane, in the sense that the union of the boundaries of the pseudo-circles is a connected set.

Table of values

n a(n)
0 1
1 1
2 1
3 6
4 139
5 28643

List of values

[1, 1, 1, 6, 139, 28643]

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

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