If I wanted to fund a yearly amount of $500 so that my heirs can spend it 50 years from now and forever towards a grand soiree party.

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If I wanted to fund a yearly amount of $500 so that my heirs can spend it 50 years from now and forever towards a grand soiree party. And, the money was invested in a saving account that offered a 6% compound interest. Using the regular payment formula (Chen, 2009) what is the total amount of money in 50 years from now? I had calculated $145,168.33 in the bank, but this must not be correct.