n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 11 |
4 | 31 |
5 | 309 |
6 | 1028 |
7 | 12251 |
8 | 43390 |
9 | 564163 |
10 | 28192750 |
11 | 105097565 |
12 | 5586502348 |
13 | 80316571436 |
14 | 305761713237 |
15 | 4461632979717 |
16 | 252252704148404 |
17 | 14458792895301660 |
18 | 55890484045084135 |
19 | 3249254387052557215 |
20 | 48995571600129458363 |
21 | 190499823401327905601 |
[2,4,11,31,309,1028,12251,43390,564163,28192750, 105097565,5586502348,80316571436,305761713237, 4461632979717,252252704148404,14458792895301660, 55890484045084135,3249254387052557215, 48995571600129458363,190499823401327905601] |