found at https://www.laceknittingstitches.com/2015/10/7-openwork-hourglass.html adapted a bit
3, P1, k1 , p4, repeat from to last 3 st, p3
Shown with a cast-on count of 20 stitches.
1 2 3 4 5 Horizontal repeats
1 2 3 4 5 Vertical repeats