A134381-OEIS公司

A134381号作为一个简单的表

n个	a（n）
0	1
1	2
2	5
三	15
4	52
5	205
6	921
7	4766
8	28685
9	201159
10	1630840
11	15071725
12	156331161
13	1794763970
14	22548418541
15	307236496071
16	4507944378004
17	70813851019717
18	1185225078743601
19	21049903662123422
20	395303080572770549
21	7825181077750155999
22	162835332607069248760

[1,2,5,15,52,205,921,4766,28685,201159,1630840,15071725,156331161,1794763970,22548418541,307236496071,4507944378004,70813851019717,1185225078743601,21049903662123422,395303080572770549,7825181077750155999,162835332607069248760]