Record Case Detail - VG101 SU2022 (YiFei) - JOJ

This function is in beta test. Please help improve it in the issues here.

{Out of memory. The likely cause is an infinite recursion within the program.

Error in ex6>rule (line 15)
    sum = ((-1)^(a+1))/(n+2) + rule(n-2);
}

Your answer may be identical to the JOJ answer in the first several lines.

However, the main problem you meet now is Memory Exceeded.

Please double check your code to solve this problem and try again.

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