From Barbara G. Walker, A Treasury of Knitting Patterns, p. 24. "This pattern may be varied by increasing or decreasing the number of purl stitches on the right side (i.e., p2, k4 etc.) or by knitting and purling into the back loops of those stitches which form a knit stripe on the right side. In any case, the pattern is developed by moving the stripes one stitch over to the left or right on every row."
Shown with a cast-on count of 22 stitches.