Row 3-8: inc 1 st at each end of rows 3,5 and 7 [18 sts]
You cast on at each end, 2 sts. increased on 3 rows, that'll make your count come out right.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper