Find the sum to n terms: 3.1^2 + 5.2^2 + 7.3^2 | Sequence and Series

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Find the sum to n terms: 3.1^2 + 5.2^2 + 7.3^2 | Sequence and Series | NCERT | Maths
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Sir, the series 3.8+6.11+9.14+...n the can the Tn be n(n+5)? Bcoz if n=3 then 3*(3+5)= 3*8 again n=6 then n*(n+5) we get 6*(6+5)= 6*11 and if n=9 then n(n+5)= 9*(9+5)= 9*14 so why will not be the Tn = n(n+5)?

arkabhattacharya