Question

What is the next number in the sequence -1, 4,21,56,115,204,…?

Answer 1

Step-by-step explanation:

1×1×1–1×2= -1

2×2×2–2×2= 4

3×3×3–3×2=21

4×4×4–4×2= 56

5×5×5–5×2= 115

6×6×6–6×2= 204

7×7×7–7×2= 329