I need to optimaze my code that containt two loops. The code is for calculating a sum of numbers

I was traying to write a code that calculate the sum of 2*j+i+1 where 0<=j<=i<=n but I wasn't very optimazed there are my code :

def get_sum(n):
    s=0
    for j in range(n+1):
        ss=0
        ss=sum(2*j+i+1 for i in range(j,n+1))
        s+=ss
    return s

Write to calculate a a sum of 2*j+i+1 where 0<=j<=i<=n but it wasn't optimazed

source https://stackoverflow.com/questions/74267736/i-need-to-optimaze-my-code-that-containt-two-loops-the-code-is-for-calculating

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