A005173-OEIS公司

A005173号作为一个简单的表

n个	a（n）
1	0
2	1
三	12
4	61
5	240
6	841
7	2772
8	8821
9	27480
10	84481
11	257532
12	780781
13	2358720
14	7108921
15	21392292
16	64307941
17	193185960
18	580082161
19	1741295052
20	5225982301
21	15682141200
22	47054812201
23	141181213812
24	423577195861
25	1270798696440

[0,1,12,61,240,841,2772,8821,27480,84481,257532,780781,2358720,7108921,21392292,64307941,193185960,580082161,1741295052,5225982301,15682141200,47054812201,141181213812,423577195861,1270798696440]