In mathematics, the Jacobsthal numbers are an integer sequence named after the German mathematician Ernst Jacobsthal. Like the related Fibonacci numbers, they are a specific type of Lucas sequence and are defined by a similar recurrence relation: in simple terms, the sequence starts with 0 and 1, then each following number is found by adding the number before it to twice the number before that. The first Jacobsthal numbers are:: 0, 1, 1, 3, 5, 11, 21, 43, 85, 171, 341, ... (Sequence A001045 in the OEIS)
Calculate Jacobsthal Number
20, 40, 60
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