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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 55 |
| 4 | 716 |
| 5 | 12085 |
| 6 | 250726 |
| 7 | 6172915 |
| 8 | 175903400 |
| 9 | 5694587209 |
| 10 | 206438732810 |
| 11 | 8284550317351 |
| 12 | 364605758728828 |
| 13 | 17461047965591581 |
| 14 | 903964982917764782 |
| 15 | 50306323769422679995 |
| 16 | 2994799872257498255696 |
| 17 | 189906103853462927405329 |
| 18 | 12779300537432602189228306 |
[1,1,6,55,716,12085,250726,6172915,175903400, 5694587209,206438732810,8284550317351, 364605758728828,17461047965591581, 903964982917764782,50306323769422679995, 2994799872257498255696,189906103853462927405329, 12779300537432602189228306] |