#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np

# %%
T = int(readline())


# %%
def calc_from_left(A):
    N = len(A)
    dp = np.zeros((N, N), np.int32)
    for i in range(1, N):
        B = A[:i]
        cond1 = (A[i] > B)[:, None] & (B[:, None] >= B[None, :])
        cond2 = (A[i] - B)[:, None] > (B[:, None] - B[None, :])
        cond = cond1 & cond2
        dp[i, :i] = ((dp[:i, :i] + 1) * cond).max(axis=1)
    return dp.max(axis=1)


def solve():
    N = int(readline())
    A = np.array(readline().split(), np.int64)
    dp1 = calc_from_left(A)
    dp2 = calc_from_left(A[::-1])[::-1]
    return max(x + y for x, y in zip(dp1, dp2)) + 1


# %%
for _ in range(T):
    print(solve())