Signed Generalized Stirling Polynomials, Nested Sums, and Hyperbolic Secant Integral Identities
We begin with signed generalized Stirling polynomials arising from a generalization of Malmsten's integral and show how their structure gives recurrence relations, gamma-polygamma formulas, a finite approximation to \(\cosh \pi x\), signed residues of the Barnes multiple zeta function, reflection identities, and explicit Stirling cycle number identities. We then turn to finite nested sums built from the hyperbolic-secant integral sequence \(\chi_n\), where fixed lower bounds lead to binomial and Catalan-number coefficient counts.