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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 33 |
| 2 | 560 |
| 3 | 6511 |
| 4 | 58310 |
| 5 | 428758 |
| 6 | 2694670 |
| 7 | 14879591 |
| 8 | 73649236 |
| 9 | 331766645 |
| 10 | 1376403810 |
| 11 | 5309441207 |
| 12 | 19192493331 |
| 13 | 65435680747 |
| 14 | 211582057035 |
| 15 | 651862949646 |
| 16 | 1921320303715 |
| 17 | 5436687172806 |
| 18 | 14814852190943 |
| 19 | 38982477962760 |
[1,33,560,6511,58310,428758,2694670,14879591, 73649236,331766645,1376403810,5309441207, 19192493331,65435680747,211582057035,651862949646, 1921320303715,5436687172806,14814852190943, 38982477962760] |