The ornamental design for a lenticularpanel, as shown and described.
FIG. 1 is a top left side perspective view of the first image of a lenticular panel according to my new design;
FIG. 2 is a top right side perspective view thereof;
FIG. 3 is a top plan view of the second image thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a front view thereof, and,
FIG. 8 is a bottom view thereof.
The broken lines in FIGS. 1 through 3 depicting graphical flower-shaped or heart-shaped indicia are for illustrative purposes only and form no part of the claimed design.