A054433-OEIS公司

A054433号作为一个简单的表

n个	a（n）
1	1
2	4
三	9
4	33
5	80
6	174
7	588
8	1596
9	3135
10	9950
11	28512
12	56268
13	196040
14	496496
15	888300
16	3524577
17	9224880
18	18118362
19	63239220
20	150527400
21	310190454
22	1129200138
23	2971168704
24	5834056536
25	18513646430
26	53213956640
27	104687896833

[1,4,9,33,80,174,588,1596,3135,9950,28512,56268,196040,496496,888300,3524577,9224880,18118362,63239220,150527400,310190454,1129200138,2971168704,5834056536,18513646430,53213956640,104687896833]