Great use of recursion. Unfortunately, this solution should fail the updated test suite due to performance (time out) for cases n>36;
Thanks for the tip off. By the way, it turns out that in the updated Test Suite there is an inherent imprecision (or 'tolerance') of about ±64 in the stated 'correct' result for n=70: see Solution 1528518. On the other hand, you could enforce exact solutions even for n=70 as suggested in Solution 1528517 (like Problem 44628). —DIV
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