S = 1 − 3 3 2 ! + 5 4 3 ! − 7 5 4 ! + . . . ± N M ( N + 1 2 ) ! {\displaystyle S=1-{\frac {3^{3}}{2!}}+{\frac {5^{4}}{3!}}-{\frac {7^{5}}{4!}}+...\pm {\frac {N^{M}}{({\frac {N+1}{2}})!}}}
S = Σ i = 1 M ( 2 × i − 1 ) ( i + 1 ) i ! {\displaystyle S=\Sigma _{i=1}^{M}{\frac {(2\times i-1)^{(i+1)}}{i!}}}
