2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/158267We study Schur Q-polynomials evaluated on a geometric progression, or equivalently q-enumeration of marked shifted tableaux, seeking explicit formulas that remain regular at q=1. We obtain several such expressions as multiple basic hypergeometric series, and as determinants and pfaffians of continuous q-ultraspherical or continuous q-Jacobi polynomials. As special cases, we obtain simple closed formulas for staircase-type partitions.34 pages; Appendix added, several minor improvements of previous versionCombinatoricsClassical Analysis and ODEs05E05, 05E10, 33D52text