A247295-OEIS公司

A247295号作为一个简单的表

n个	a（n）
0	1
1	1
2	2
三	4
4	7
5	14
6	30
7	64
8	141
9	316
10	713
11	1626
12	3740
13	8659
14	20176
15	47274
16	111302
17	263201
18	624860
19	1488736
20	3558412
21	8530533
22	20505468
23	49413242
24	119347708
25	288873639
26	700582008
27	1702190653
28	4142880297
29	10099352082
30	24656876772
31	60283224645
32	147581756005

[1,1,2,4,7,14,30,64,141,316,713,1626,3740,8659,20176,47274,111302,263201,624860,1488736,3558412,8530533,20505468,49413242,119347708,288873639,700582008,1702190653,4142880297,10099352082,24656876772,60283224645,147581756005]