The graph of {a n } is given below. Evaluate the specified sum. <img alt='{"mathml":"<math style=\"font-family:stix;font-size:16px;\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mstyle mathsize=\"16px\"><munderover><mo>∑</mo><mrow><mi>i</mi><mo>=</mo><mn>1</mn></mrow><mn>6</mn></munderover><msup><msub><mi>a</mi><mi>i</mi></msub><mn>3</mn></msup><mo>-</mo><mn>1</mn></mstyle></math>","truncated":false}' class="fr-fic fr-dii" height="59" src="https://lightcat-files.s3.amazonaws.com/problem_images/951008c3df39b687-1672237830417.jpg" title="sum from i equals 1 to 6 of a subscript i cubed minus 1" width="94"/>

The graph of {an} is given below. Evaluate the specified sum.

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