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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 353 |
| 5 | 4061 |
| 6 | 54221 |
| 7 | 820205 |
| 8 | 13829377 |
| 9 | 256853629 |
| 10 | 5208050365 |
| 11 | 114465346733 |
| 12 | 2711004465185 |
| 13 | 68846143222013 |
| 14 | 1866577974450733 |
| 15 | 53824099877628077 |
| 16 | 1645120108520147713 |
| 17 | 53135285623703158429 |
| 18 | 1808560829585046118685 |
| 19 | 64707781796679229092045 |
| 20 | 2428043851750587122468513 |
[1,1,5,37,353,4061,54221,820205,13829377, 256853629,5208050365,114465346733,2711004465185, 68846143222013,1866577974450733,53824099877628077, 1645120108520147713,53135285623703158429, 1808560829585046118685,64707781796679229092045, 2428043851750587122468513] |