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

1, 4, 3, 4, 5, 6

Offset: 3

Author

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

Keywords

• nonn
• more
• uned
• obsc

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.