arXiv2026
In this work, the author employs the Faà di Bruno formula, identities for the partial Bell polynomials, two combinatorial identities, and the (logarithmically) complete monotonicity of generating functions for several integer sequences, together with the Wronski theorem, to investigate a collection of analytic and combinatorial structures. The study establishes Taylor series expansions for various functions involving the inverse (hyperbolic) tangent function and derives the Maclaurin expansion of the Wilf function, a composite of the inverse tangent, square root, and exponential functions. The coefficients in this expansion are expressed in terms of Stirling numbers of the second kind, and their generating functions, limits, positivity, monotonicity, and logarithmic convexity are analyzed. The paper further presents closed-form formulas for special values of the Gauss hypergeometric function and for certain partial Bell polynomials, along with several infinite series representations of the circular constant and related sequences. An asymptotic rational approximation to the circular constant is recovered, and connections among several integer sequences are established via determinants.