求下列数列的通项公式1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700,1767263190,6564120420,24466267020,91482563640,343059613650,1289904147324,4861945401452,18367353072152,695335509016004,2
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![求下列数列的通项公式1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700,1767263190,6564120420,24466267020,91482563640,343059613650,1289904147324,4861945401452,18367353072152,695335509016004,2](/uploads/image/z/1102024-64-4.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F1%2C2%2C5%2C14%2C42%2C132%2C429%2C1430%2C4862%2C16796%2C58786%2C208012%2C742900%2C2674440%2C9694845%2C35357670%2C129644790%2C477638700%2C1767263190%2C6564120420%2C24466267020%2C91482563640%2C343059613650%2C1289904147324%2C4861945401452%2C18367353072152%2C695335509016004%2C2)
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