  We study the perturbative S-matrix of closed strings in the two-dimensional
type 0B string theory from the worldsheet perspective, by directly integrating
correlation functions of ${\cal N}=1$ Liouville theory. The latter is computed
numerically using recurrence relations for super-Virasoro conformal blocks. We
show that the tree level 3- and 4-point amplitudes are in agreement with the
proposed dual matrix quantum mechanics. The non-perturbative aspects of the
duality will be analyzed in a companion paper.
