sum[1/n! (-2)^(n-1) 3^(1 - (3 n)/4) factorialpower((n/4), -1 + n),{n,1,80}]sum[1/n! (-2)^(n-1) 3^(1 - (3 n)/4) factorialpower((n/4), -1 + n),{n,1,80}]

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