Is my bitcoin lost or.....

In 2013 I bought 1 bit[Suspicious link removed]d idea yeah!)

I sent it to this address: 1MAUuNVNQgc4s5Cp15Xz9R7wD5DamwG5mL

I used a Blockchain.info wallet but I think I used the wrong address. These days I can import that address as a "watch-only" address and indeed there is still the 1 bitcoin on it.

I have the 12 phrases and I tried 2 solutions:

1. https://iancoleman.io/bip39/
That generateds thousands of addresses but still after 50k addresses I don't see the one I mentioned above. And the systems stops after about 80k adresses.

2. https://docs.google.com/d...d8EEdvG_hQuEXw_f_o6w/edit
In that documentation they speak about going to developer console and insert this after the ">": Blockchain.MyWallet.wallet._getPrivateKey(account#,"M/0/index#")
If you do so and press enter a private key is printed. However I don't know the "index#. How / where can I find it?

If somebody has the solution for me there will be reward in 1 btc in the exchange rate of december 18th 2013!

Thanks in advance,
Eric.