make a recursive function in PYTHON called sequence that takes a postive number and returns the value of Wn

Sn rule is

another way of saying it if the last three terms of the sequence you've found are a b c then the next term in the sequence is a+b+b+c.

so the first number in the sequence would be

then the number in the sequence are

0, 1, 2, 4, 9, 19, 41, 88, 189, 406, 882 ....

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