a_n= n^4/((1-n)^2*(1-n^6)) I think this is the sequence formula... I can't find formula for the sum yet...
I have a the following expression
0 + 5 + 14 + 33 + 56 + 85 + 120 = 313
I tried to find the pattern between these numbers to find a formula for the sum. I used subtraction and tried to find GCD but no luck. Can you please help me?