A polynomial bosonic form of statistical configuration sums and the odd/even minimal excludant in integer partitions

Abstract: Inspired by the study of the minimal excludant in integer partitions by G.E. Andrews and D. Newman, we introduce a pair of new partition statistics, sqrank and rerank. It is related to a polynomial bosonic form of statistical configuration sums for an integrable cellular automaton. For all nonnegative integer $n$, we prove that the partitions of $n$ on which sqrank or rerank takes on a particular value, say $r$, are equinumerous with the partitions of $n$ on which the odd/even minimal exclutant takes on the corresponding value, $2r+1$ or $2r+2$.