1+sum[(-exp((-3.5-1)/4))^(n) (LaguerreL[-1 + n, 1, n/4]/n),{n,1,30}]1+sum[(-exp((-3.5-1)/4))^(n) (LaguerreL[-1 + n, 1, n/4]/n),{n,1,30}]

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