n | a(n) |
---|---|
0 | 1 |
1 | 18 |
2 | 114 |
3 | 582 |
4 | 3466 |
5 | 20938 |
6 | 129642 |
7 | 813586 |
8 | 5161418 |
9 | 33012690 |
10 | 212531034 |
11 | 1375465890 |
12 | 8940439306 |
13 | 58322410658 |
14 | 381620168176 |
15 | 2503490173972 |
16 | 16459423126778 |
17 | 108417784128158 |
18 | 715300322712000 |
19 | 4725856346389840 |
[1,18,114,582,3466,20938,129642,813586,5161418, 33012690,212531034,1375465890,8940439306, 58322410658,381620168176,2503490173972, 16459423126778,108417784128158,715300322712000, 4725856346389840] |