  We numerically investigate the influence of interactions on the generalized
Hong-Ou-Mandel (HOM) effect for bosonic particles and show results for the
cases of $N=2$, $N=3$ and $N=4$ bosons interacting with a beam splitter, whose
role is played by a $\delta$-barrier. In particular, we focus on the effect of
attractive interactions and compare the results with the repulsive case, as
well as with the analytically available results for the non-interacting case
(that we use as a benchmark). We observe a fermionization effect both for
growing repulsive and attractive interactions, i.e., the dip in the HOM
coincidence count is progressively smeared out, for increasing interaction
strengths. The role of input asymmetries is also explored.

Quantum Gases