The ornamental design for a lenticularpanel, as shown and described.
FIG. 1 is an elevation view of the lenticular panel depicting a first image of the lenticular panel.
FIG. 2 is an elevation view of the lenticular panel depicting a second image of the lenticular panel.
FIG. 3 is a perspective forming no part of the claimed design view of a lenticular panel depicting a view of the lenticular panel when observed from a first angle with broken lines illustrating a rectangular box to provide perspective; and, FIG. 4 is a perspective forming no part of the claimed design view of a lenticular panel depicting a view of the lenticular panel when observed from a second angle with broken lines illustrating a rectangular box to provide perspective.