What will be in the triangle? || Puzzle 7

The next puzzle will be posted after solving this…

Plz,give a clue to solve this

Hint: Try to solve using power…

Answer ki ekhane dibo na email e

Eikhane bolen please,

Is the answer is 684?

How?
Can you prove this?

n! - n^2, where n is n-th triangle.

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Great!!!
Well done!!!

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