n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 8 |
4 | 21 |
5 | 53 |
6 | 145 |
7 | 405 |
8 | 1180 |
9 | 3562 |
10 | 11030 |
11 | 35306 |
12 | 115338 |
13 | 387443 |
14 | 1326992 |
15 | 4650201 |
16 | 16604351 |
17 | 60443887 |
18 | 223971602 |
19 | 844095896 |
20 | 3234044019 |
21 | 12582749734 |
22 | 49703821584 |
23 | 199149007691 |
24 | 809153896365 |
25 | 3331563584486 |
[2,4,8,21,53,145,405,1180,3562,11030,35306,115338, 387443,1326992,4650201,16604351,60443887, 223971602,844095896,3234044019,12582749734, 49703821584,199149007691,809153896365, 3331563584486] |