n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 12 |
4 | 49 |
5 | 249 |
6 | 1499 |
7 | 10493 |
8 | 83946 |
9 | 755519 |
10 | 7555194 |
11 | 83107140 |
12 | 997285682 |
13 | 12964713872 |
14 | 181505994212 |
15 | 2722589913192 |
16 | 43561438611080 |
17 | 740544456388374 |
18 | 13329800214990740 |
19 | 253266204084824069 |
20 | 5065324081696481381 |
[2,4,12,49,249,1499,10493,83946,755519,7555194, 83107140,997285682,12964713872,181505994212, 2722589913192,43561438611080,740544456388374, 13329800214990740,253266204084824069, 5065324081696481381] |