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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 42 |
| 3 | 429 |
| 4 | 4862 |
| 5 | 58786 |
| 6 | 742900 |
| 7 | 9694845 |
| 8 | 129644790 |
| 9 | 1767263190 |
| 10 | 24466267020 |
| 11 | 343059613650 |
| 12 | 4861946401452 |
| 13 | 69533550916004 |
| 14 | 1002242216651368 |
| 15 | 14544636039226909 |
| 16 | 212336130412243110 |
| 17 | 3116285494907301262 |
| 18 | 45950804324621742364 |
| 19 | 680425371729975800390 |
[1,5,42,429,4862,58786,742900,9694845,129644790, 1767263190,24466267020,343059613650,4861946401452, 69533550916004,1002242216651368,14544636039226909, 212336130412243110,3116285494907301262, 45950804324621742364,680425371729975800390] |