2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140200A family of sequences produced by a non-homogeneous linear recurrence formula derived from the geometry of circles inscribed in lenses is introduced and studied. Mysterious ``underground'' sequences underlying them are discovered in this paper.33 pages, 19 figuresNumber TheoryMetric Geometry11B37, 11B39, 11B83text