| (Oral Ccp) Soit {u_{0}=3}, {u_{n+1}=\displaystyle\sum_{k=0}^{n}\binom{n}{k}u_{k}u_{n-k}}. On pose {f(x)=\displaystyle\sum_{n=0}^{+\infty}\dfrac{u_{n}}{n!}x^{n}}.
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| (Oral Ccp) Soit {u_{0}=3}, {u_{n+1}=\displaystyle\sum_{k=0}^{n}\binom{n}{k}u_{k}u_{n-k}}. On pose {f(x)=\displaystyle\sum_{n=0}^{+\infty}\dfrac{u_{n}}{n!}x^{n}}.
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