n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 28 |
5 | 278 |
6 | 3558 |
7 | 55600 |
8 | 1024459 |
9 | 21721922 |
10 | 520585084 |
11 | 13908591504 |
12 | 409749226342 |
13 | 13192559204352 |
14 | 460792929469356 |
15 | 17351608517036848 |
16 | 700669956538570048 |
17 | 30200986529461293238 |
18 | 1383912736505236230958 |
[1,1,4,28,278,3558,55600,1024459,21721922, 520585084,13908591504,409749226342,13192559204352, 460792929469356,17351608517036848, 700669956538570048,30200986529461293238, 1383912736505236230958] |