n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 14 |
4 | 56 |
5 | 282 |
6 | 1696 |
7 | 11876 |
8 | 95010 |
9 | 855097 |
10 | 8550971 |
11 | 94060683 |
12 | 1128728204 |
13 | 14673466654 |
14 | 205428533159 |
15 | 3081427997387 |
16 | 49302847958201 |
17 | 838148415289426 |
18 | 15086671475209678 |
19 | 286646758028983900 |
20 | 5732935160579678000 |
[2,4,14,56,282,1696,11876,95010,855097,8550971, 94060683,1128728204,14673466654,205428533159, 3081427997387,49302847958201,838148415289426, 15086671475209678,286646758028983900, 5732935160579678000] |