  As a first numerical application of the light-front coupled-cluster (LFCC)
method, we consider the odd-parity massive eigenstate of $\phi_{1+1}^4$ theory.
The eigenstate is built as a Fock-state expansion in light-front quantization,
where wave functions appear as coefficients of the Fock states. A standard
Fock-space truncation would then yield a finite set of linear equations for a
finite number of wave functions. The LFCC method replaces Fock-space truncation
with a more sophisticated truncation, one which reduces the eigenvalue problem
to a finite set of nonlinear equations without any restriction on Fock space.
We compare our results with those obtained with a Fock-space truncation that
yields the same number of equations.
