This dataset has been published in the following paper:

Kobayashi, K., Kable, J. W., Hsu, M. & Jenkins, A. C. Neural representations of others' traits predict social decisions. PNAS, https://www.pnas.org/doi/10.1073/pnas.2116944119.
 
32 participants completed a modified dictator game paradigm, in which they made eight binary choices on monetary allocation against 20 different recipients with different social group memberships across two scanning runs.

Behavioral data is available at OSF: https://osf.io/qkrhm/.