∫0zHi⁡(-t)⁢ⅆ⁡t∼1π⁢ln⁡z+2⁢γ+ln⁡33⁢π+1π⁢∑k=1∞(-1)k-1⁢(3⁢k-1)!k!⁢(3⁢z3)k,