A124828-OEIS公司

A124828号作为一个简单的表

n个	a（n）
0	1
1	7
2	29
三	103
4	417
5	1717
6	7229
7	30793
8	132225
9	570649
10	2470769
11	10719793
12	46569777
13	202477633
14	880792193
15	3832748833
16	16681516545
17	72613292353
18	316105114817
19	1376159456641
20	5991281182977
21	26084303730049

[1,7,29,103,417,1717,7229,30793,132225,570649,2470769,10719793,46569777,202477633,880792193,3832748833,16681516545,72613292353,316105114817,1376159456641,5991281182977,26084303730049]