  A difficult problem in the theory of random tensors is to calculate the
expectation values of polynomials in the tensor entries, even in the large N
limit and in a Gaussian distribution. Here we address this issue, focusing on a
family of polynomials labeled by permutations, which naturally generalize the
single-trace invariants of random matrix models. Through Wick's theorem, we
show that the Feynman graph expansion of the expectation values of those
polynomials enumerates meandric systems whose lower arch configuration is
obtained from the upper arch configuration by a permutation on half of the arch
feet. Our main theorem reduces the calculation of expectation values to those
of polynomials labeled by stabilized-interval-free permutations (SIF) which are
proved to enumerate irreducible meandric systems. This together with explicit
calculations of expectation values associated to SIF permutations allows to
exactly evaluate large N expectation values beyond the so-called melonic
polynomials.
