  Recent experiments [Nature 521, 196 (2015) and Nat. Commun. 8, 395 (2017)]
have presented evidence for electron pairing in a quantum dot beyond the
superconducting regime. Here, we show that the impact of an attractive
electron-electron interaction on the full counting statistics of electron
transfer through a quantum dot is qualitatively different from the case of a
repulsive interaction. In particular, the sign of higher-order (generalized)
factorial cumulants reveals more pronounced correlations, which even survive in
the limit of fast spin relaxation.
