Online calculator which helps you calculate the square of a triangular number.
In the theory of numbers square triangular number (or triangular square number) is a number which is triangular, and square, there are an infinite number of square triangular numbers.
Square triangular numbers form a sequence:
0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881, 55420693056, 1882672131025, ... (A001110 sequence in OEIS).