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Recursive Formula

How to find the first few terms of the given sequence in recursive formula: 3 examples and their solutions.

Examplea1 = 4, an + 1 = an + 6

Examplea1 = -2, an + 1 = an + 3n

Examplea1 = 1, a2 = 1, an + 2 = an + an + 1