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A function f is defined as follows F(N)= (1) +(2*3) + (4*5*6) ... N. Given an integer **N** the task is to print the F(N)th term.

**Example 1:**

**Input:** N = 5
**Output:** 365527
**Explaination:** F(5) = 1 + 2*3 + 4*5*6 + 7*8*9*10
+ 11*12*13*14*15 = 365227.

**Your Task:**

You do not need to readd input or print anything. Your task is to complete the function **sequence()** which takes N as input parameter and returns the value of F(N).

**Expected Tiime Complexity:** O(N^{2})

**Expected Auxiliary Space:** O(1)

**Constraints:**

1 ≤ N ≤ 10

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