What is the number N ? Is it the number of colors or of flags?

From the problem discussion, it turns out to be a fibonacci sequence.
And...
N = 3   M = 4
N = 4   M = 6    ---------?? how come?
N = 5   M = 10
and etc...

How come M = 6 when N = 4?

N, the number of the stripes, stripes isn't a color neither flags, it's just the columns of the table ;)


Edited by author 11.11.2011 20:24

Let red color is 1, white color is 2 and blue color is 3. We can get only 6 positions that correspond to our condition. They are 1321, 2132, 1321,2312,1212,2121, is it right?