#N circle-generator.rle
#O AforAmpere, 21 May 2021
#C
#C A pattern that generates a circle from a single dot. In generation n,
#C the perimeter of the pattern is the circle x^2+y^2≤n.
#C
#C Reference:
#C https://conwaylife.com/forums/viewtopic.php?p=130653#p130653
x = 1, y = 1, rule = Circle
C!