@78鼠鼠 @156****6690@仰天长啸你爹驾到@AC酱 骚扰挂几个同学(((
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卡特兰数:
H(1)=1H(1)=1H(1)=1
H(n)=4n−2n+1×H(n−1)H(n)=\frac {4n-2}{n+1} \times H(n-1)H(n)=n+14n−2 ×H(n−1)
P1044 模板
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第二类斯特林数:
S(n,m)=1(n=m或m=1)S(n,m)=1 (n=m 或 m=1)S(n,m)=1(n=m或m=1)
S(n,m)=S(n−1,m−1)+m×S(n−1,m)S(n,m)=S(n−1,m−1)+m \times S(n−1,m)S(n,m)=S(n−1,m−1)+m×S(n−1,m)