From Odhams Encyclopaedia of Knitting by James Norbury and Margaret Agutter.
I've reversed the pattern so that the decreases are all k2tog rather than ssk because I find k2tog quicker to knit than ssk..
Shown with a cast-on count of 22 stitches.
1 2 3 4 5 Horizontal repeats
1 2 3 4 5 Vertical repeats
Swatch photo uploaded by chrisfourfalcon