import sys
readline=sys.stdin.buffer.readline
import numpy as np
t=int(readline())
def myon(a):
    n=len(a)
    dp=np.zeros((n, n), np.int32)
    for k in range(1, n):
        nuo=((2*a[:k, None]-a[None, :k]<a[k])&(a[:k, None]>=a[None, :k]))
        dp[k, :k]=((dp[:k, :k]+1)*nuo).max(axis=1)
    return np.max(dp, axis=1)
def solve():
    n=int(readline())
    a=np.array(readline().split(), np.int32)
    print(np.max(myon(a)+myon(a[::-1])[::-1])+1)
for _ in range(t):
    solve()