Entropy functions for accelerating black holes

We introduce an entropy function for supersymmetric accelerating black holes in four-dimensional antide Sitter space that uplift on general Sasaki-Einstein manifolds X-7 to solutions of M theory. This allows one to compute the black hole entropy without knowing the explicit solutions. A dual holographic microstate counting would follow from computing certain supersymmetric partition functions of Chern-Simons-matter theories compactified on a spindle. We make a general prediction for a class of such partition functions in terms of "blocks," with each block being constructed from the partition function on a three-sphere.