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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.

A274823 Total number of regions in all arrangements of n circles in the affine plane, excluding the regions that do not belong to the circles.

Original entry on oeis.org

1, 7, 65
Offset: 1

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Author

Omar E. Pol, Jul 07 2016

Keywords

Comments

In other words: not counting the regions between circles.
Consider the arrangements of n circles described in A250001.

Crossrefs

Row sums of triangle A274819.
For another version see A274822.
Cf. A250001, A274777.

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