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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.

A287149 Number of arrangements of n circles in the affine plane having only one island or region, which is formed by the union of all solid circles of the arrangement.

Table of values

n a(n)
0 1
1 1
2 2
3 11
4 155

List of values

[1, 1, 2, 11, 155]

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

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