#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
 
#define REP(i,s,n) for(int i=s;i<n;i++)
#define rep(i,n)   REP(i,0,n)
#define inf (1<<29)
#define MAX 80
using namespace std;

bool dp[MAX][MAX][2];
 
int main()
{
  int T;
  while(cin >> T)
    {
      while(T--)
	{
	  rep(i,MAX)rep(j,MAX)rep(l,2)dp[i][j][l] = false;
	  int N;
	  cin >> N;
	  int input[N];
	  rep(i,N) cin >> input[i];
       
	  if(N <= 2)
	    {
	      cout << input[N-1] << endl;
	      continue;
	    }
       
	  int ans = input[N-1];
 
	  REP(cur,1,N-1)
	    {
	      dp[input[cur-1]][input[cur]][cur&1] = true;
	      int R = input[cur+1];
	      rep(L,MAX)
		{
		  rep(M,MAX)
		    {
		      if(!dp[L][M][cur&1])continue;
		      //cout << cur << " cur(" << L << "," << M << "," << R << ")\n";
		      if(M == 0)
			{
			  if(cur+2 < N)
			    {
			      dp[M][R][(cur+1)&1] = true;
			      //cout << cur << " next ( " << M << "," << R << "," << input[cur+2] << ")\n";
			    }
			  else       ans = max(ans,R);
			}
		      else
			{
			  if(cur+2 < N)
			    {
			      dp[M][R][(cur+1)&1] = true;
			      //cout << cur << " next ( " << M << "," << R << "," << input[cur+2] << ")\n";
			      dp[M-1][R+L][(cur+1)&1] = true;
			      //cout << cur << " next ( " << M-1 << "," << R+L << "," << input[cur+2] << ")\n";
			    }
			  else 
			    {
			      ans = max(ans,R+L);
			      //cout << cur << " ans : " << R << "+" << L << "=" << R+L <<  " (" << L << "," << M << "," << R << ")" <<  endl;
			    }
			}
		    }
		}
	      rep(i,MAX)rep(j,MAX)dp[i][j][cur&1] = false;
	    }
	  
	  cout << ans << endl;      
	}
    }
  return 0;
}