  In one spatial dimension, quantum systems with an attractive three-body
contact interaction exhibit a scale anomaly. In this work, we examine the
few-body sector for up to six particles. We study those systems with a
self-consistent, non-perturbative, iterative method, in the subspace of zero
total momentum. Exploiting the structure of the contact interaction, the method
reduces the complexity of obtaining the wavefunction by three powers of the
dimension of the Hilbert space. We present results on the energy, and momentum
and spatial structure, as well as Tan's contact. We find a Fermi-Fermi
crossover interpolating between large, weakly bound trimers and compact, deeply
bound trimers: at weak coupling, the behavior is captured by degenerate
perturbation theory; at strong coupling, the system is governed by an effective
theory of heavy trimers (plus free particles in the case of asymmetric
systems). Additionally, we find that there is no trimer-trimer attraction and
therefore no six-body bound state.
