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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 41 |
| 4 | 399 |
| 5 | 4263 |
| 6 | 48335 |
| 7 | 571061 |
| 8 | 6953854 |
| 9 | 86659366 |
| 10 | 1099882862 |
| 11 | 14168133882 |
| 12 | 184756656826 |
| 13 | 2434227814578 |
| 14 | 32354612273352 |
| 15 | 433312539103431 |
| 16 | 5841624625609747 |
| 17 | 79211315586085551 |
| 18 | 1079630126313403483 |
| 19 | 14782787622359779197 |
| 20 | 203248589087860373309 |
| 21 | 2804882047701189052925 |
[1,1,5,41,399,4263,48335,571061,6953854,86659366, 1099882862,14168133882,184756656826,2434227814578, 32354612273352,433312539103431,5841624625609747, 79211315586085551,1079630126313403483, 14782787622359779197,203248589087860373309, 2804882047701189052925] |