This pattern is call "Entrelac" and is one sided, it consists of a first road of triangles and then a second road of squares, just of one side of the triangles, and then other road of squares in the opposite direction. Here's how to begin: Row 1 (right side) - K1, turn. Row 2 (wrong side) - Purl 1 (P1), turn. Row 3 - Slip (SL) 1 knitwise (KW), K1, turn. Row 4 - P2, turn. Row 5 - SL 1 KW, K2, turn. Row 6 - P3, turn. Repeat rows 5 and 6, adding 1 more knit SL for every right side row until you've worked 8 stitches, ending with row 5. Don't turn your work, place your marker, repeat from row 1, 12 more times.