This is 21 to 1 - cross dots.
This is a simple 10 X 10 straight dotted kolam.
The dots pattern for the below is (2,4,6,8,10,10,8,6,4,2). Some more dots in the middle of the 4 dots as seen in the picture. This can be enlarged, by increasing it on multiple of 4 like 14 to 2, 18 to 2, and so...
21 to 11 interlaced dots (idukku pulli).