$\"\"$

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The sequence is $\"\"$ and $\"\"$ .

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Above sequence substitute n = 1.

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$\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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$\"\"$ (Substitute n = 2)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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$\"\"$ (Substitute n = 3)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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$\"\"$ (Substitute n = 4)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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The first five terms of the sequence are 6, 10, 15, 21, and 28.