🚀 go-pugleaf

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\[ {\cal S}!\left( \frac{1}{{\cal P}} \right)^{{\cal S}+1} 
    \sum_{s=1}^\infty \sum_{{\cal S}-sp\ge 0, p\in N} 
           \frac{p}{(s!)^p({\cal S}-sp)!} 
           \frac{\displaystyle 2^k\left( { s \atop k } \right)}
               {\displaystyle  \sum_{j=0}^k \left( { s\atop j} \right)}. \]

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Shiroh SUZUKI
Yajima, Konno Lab.
Dept. of Mathematical and Computing Sciences
Graduate School of Information Science and Engineering
Tokyo Institute of Technology
e-mail:shirou@is.titech.ac.jp,byq00327@niftyserve.or.jp