Square Triangles

What is the smallest positive integer greater than 11 that is both a triangular number and a perfect square?

Note: A triangular number is a number which can be expressed as a sum of the first nn positive integers, such as 6=1+2+36 = 1+2+3 or 15=1+2+3+4+515 = 1+2+3+4+5.

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