A262912-OEIS公司

A262912型作为一个简单的表

n个	a（n）
1	1
2	6
三	15
4	53
5	318
6	1207
7	5797
8	34782
9	189135
10	1089701
11	6538206
12	38547751
13	229660021
14	1377960126
15	8242589055
16	49395098933
17	296370593598
18	1777250964247
19	10661181588037
20	63967089528222
21	383764138693935
22	2302493636842181

[1,6,15,53,318,1207,5797,34782,189135,1089701,6538206,38547751,229660021,1377960126,8242589055,49395098933,296370593598,1777250964247,10661181588037,63967089528222,383764138693935,2302493636842181]