Find the missing number in the following number series $(3.5 \quad 2.5 \quad 3 \quad ? \quad 20 \quad 95)$

Pattern: multiply by position, then add 1. 3.5 × 1 + 1 = 4.5, but that doesn't match. Let's try: 3.5 - 1 = 2.5, 2.5 × 1 + 0.5 = 3, 3 × 2 + 0 = 6, 6 × 3 + 2 = 20, 20 × 4 + 15 = 95. Another view: (n² + 1) pattern: 3.5×1+1=4.5 no. Try: term(n) = term(n-1) × n - (n-2). 2.5 = 3.5×1-1, 3 = 2.5×2-2, 6 = 3×3-3, 20 = 6×4-4, 95 = 20×5-5. Missing: 6.