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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 15 |
| 4 | 83 |
| 5 | 556 |
| 6 | 4435 |
| 7 | 40773 |
| 8 | 423836 |
| 9 | 4908403 |
| 10 | 62606297 |
| 11 | 871421976 |
| 12 | 13136605577 |
| 13 | 213122669141 |
| 14 | 3701085673676 |
| 15 | 68480774296803 |
| 16 | 1344611320542931 |
| 17 | 27917413103561540 |
| 18 | 611000785570868627 |
| 19 | 14056645627856206809 |
| 20 | 339081826905338009620 |
| 21 | 8557085279980716462407 |
[1,1,4,15,83,556,4435,40773,423836,4908403, 62606297,871421976,13136605577,213122669141, 3701085673676,68480774296803,1344611320542931, 27917413103561540,611000785570868627, 14056645627856206809,339081826905338009620, 8557085279980716462407] |