Decadent formula

 

---

$\sum_{i=0}^{n}$$\binom{n}{i}$$\binom{n}{i}$2ⁱ=$\sum_{i=0}^{n}$$\binom{n+i}{i}$$\binom{n}{i}$

---

       Thank advise @Doveqise huge guys.

       The following content is happily decadent formula. (To be more)