cp's OEIS Frontend

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.

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A132293 Maximal number of right angles in an n-gon.

Original entry on oeis.org

1, 4, 3, 4, 5, 6
Offset: 3

Views

Author

Asher Stuhlman (asherstuhlman(AT)gmail.com), Nov 06 2007

Keywords

Comments

A proper definition is needed for this sequence.
Conjecture from R. J. Mathar, Mar 07 2008, Apr 21 2008: (Start)
The correct sequence is a(n)=A014681(n-1), because a polyomino with a zigzag "stair" shape along a diagonal provides a solution where the number of right angles equals the number of edges:
┌─────────┐
|. . . . .|
| ┘
|. . . . .
|
|. .|
| ┌─┘
|.|
└─┘
(End)
Possibly an incorrect version of A049008. - Michal Paulovic, Sep 27 2023

Examples

			The first (n=3) integer in this sequence is 1 because a triangle cannot have more than one right angle.

Crossrefs

Cf. A049008.
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