A006967-OEIS公司

A006967号作为一个简单的表

n个	a（n）
0	1
1	1
2	2
三	4
4	4
5	8
6	24
7	32
8	40
9	120
10	296
11	648
12	1328
13	3200
14	9912
15	25592
16	55920
17	143192
18	510696
19	1451296
20	3497344
21	10451824
22	38570704
23	118914992
24	315235872
25	1014824752
26	3963684496
27	13166130152
28	37846301904
29	130507967088
30	533318630936
31	1884550215976
32	5800121391936

[1,1,2,4,4,8,24,32,40,120,296,648,1328,3200,9912,25592,55920,143192,510696,1451296,3497344,10451824,38570704,118914992,315235872,1014824752,3963684496,13166130152,37846301904,130507967088,533318630936,1884550215976,5800121391936]