Don't get stumbled by the pattern row
you are on when starting this decreasing process.
Following the directions..decrease ON THE NEXT ROW (decrease row #1)...then again on decrease rows 17, 33, 49, 65, etc. until the prescribed number of stitches remain.
You'll need two "row counters":
1) for the pattern rows
2) for the decrease rows
In your case, pattern row 13
is also decrease row 1