A101090-OEIS公司

A101090标准作为一个简单的表

n个	a（n）
1	1
2	19
三	135
4	605
5	2054
6	5778
7	14178
8	31350
9	63855
10	121693
11	219505
12	378027
13	625820
14	1001300
15	1555092
16	2352732
17	3477741
18	5035095
19	7155115
20	9997801
21	13757634
22	18668870
23	25011350
24	33116850
25	43375995
26	56245761
27	72257589
28	92026135

[1,19,135,605,2054,5778,14178,31350,63855,121693,219505,378027,625820,1001300,1555092,2352732,3477741,5035095,7155115,9997801,13757634,18668870,25011350,33116850,43375995,56245761,72257589,92026135]