卡特兰数前几项为 : 1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190, 6564120420, 24466267020, 91482563640, 343059613650, 1289904147324, 4861946401452, ...
h(n)=h(n-1)*(4*n-2)/(n+1);
h(n)=C(2n,n)/(n+1) (n=0,1,2,...)
h(n)=c(2n,n)-c(2n,n+1)(n=0,1,2,...)
h(n)=h(n-1)*(4*n-2)/(n+1);
h(n)=C(2n,n)/(n+1) (n=0,1,2,...)
h(n)=c(2n,n)-c(2n,n+1)(n=0,1,2,...)