From A Second Treasury of Knitting Patterns* by Barbara Walker. Modified slightly to use ssp instead of p2tog tbl. See also this Ravelry post.
ssp
p2tog tbl
*Affiliate link. Buy the book and I get a couple pennies.
Shown with a cast-on count of 14 stitches.
1 2 3 4 5 Horizontal repeats
1 2 3 4 5 Vertical repeats