$$\sum\limits_{k=0}^{n-2}\biggl(5^{k}\cdot\sum\limits_{j=0}^{n-2-k}\biggl(4^{j}\cdot\sum\limits_{i=0}^{n-2-k-j}\biggl(\sum\limits_{m=0}^{n-2-k-j-i}\binom{n-2-k-j-i}{m}\biggr)\biggr)\biggr)\cdot\binom{n}{2}$$

Can someone get me like the first 5-7 integers of this sequence? Wolfram shits itself unfortunately and I can't be assed to write a script in python