The bi-gamma coefficients of the 1/k-Eulerian polynomials are counted by increasing pruned even k-ary forests with a specified number of old leaves.
Br¨ and´ en, Actions on permutations and unimodality of desce nt polynomials, European J
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Combinatorics on bi-$\gamma$-positivity of $1/k$-Eulerian polynomials
The bi-gamma coefficients of the 1/k-Eulerian polynomials are counted by increasing pruned even k-ary forests with a specified number of old leaves.