🌈 Recamán's Sequence Neon Arc Visualiser: Live Collision Counter, Recurrence Panel and Mini Map

Watch Recamán's sequence a(n) = a(n-1) - n (or + n) build itself as rainbow semicircular arcs above and below a number line. Zoom, pan, step through the term table, count avoided collisions live and navigate with a full-sequence mini map.