A199250-OEIS公司

A199250型作为一个简单的表

n个	a（n）
1	1
2	1
三	14
4	21
5	424
6	571
7	14160
8	18157
9	508802
10	635901
11	19257756
12	23709063
13	756845422
14	922808863
15	30595342532
16	37055004573
17	1264116241990
18	1523501274001
19	53146116905514
20	63810625823521
21	2266270709962148
22	2712945090726795

[1,1,14,21,424,571,14160,18157,508802,635901,19257756,23709063,756845422,922808863,30595342532,37055004573,1264116241990,1523501274001,53146116905514,63810625823521,2266270709962148,2712945090726795]