A285240-OEIS公司

A285240型作为一个简单的表

n个	a（n）
0	1
1	1
2	8
三	35
4	115
5	429
6	1425
7	4803
8	15398
9	48940
10	151046
11	459000
12	1373219
13	4037721
14	11723911
15	33566828
16	94993571
17	265722551
18	735543433
19	2015558930
20	5471271099
21	14719853084
22	39266487114
23	103908002173
24	272855152096
25	711272144097
26	1841162650896
27	4734074846631

[1,1,8,35,115,429,1425,4803,15398,48940,151046,459000,1373219,4037721,11723911,33566828,94993571,265722551,735543433,2015558930,5471271099,14719853084,39266487114,103908002173,272855152096,711272144097,1841162650896,4734074846631]