The ornamental design for a seatingframe, as shown and described.
FIG. 1 is a perspective view of a seating frame showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
Any shading and cross-hatching are not features of the design but are utilized to illustrate the surface contours of the seating frame design in the drawings.