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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 34 |
| 4 | 484 |
| 5 | 9946 |
| 6 | 270314 |
| 7 | 9189776 |
| 8 | 376223992 |
| 9 | 18046839982 |
| 10 | 993655820512 |
| 11 | 61803730636506 |
| 12 | 4287521490060780 |
| 13 | 328324625277864008 |
| 14 | 27514775912958768464 |
| 15 | 2505202120094546731584 |
| 16 | 246288599061132553970160 |
| 17 | 26004541628560046316399382 |
| 18 | 2935176211106696031739535696 |
[1,1,4,34,484,9946,270314,9189776,376223992, 18046839982,993655820512,61803730636506, 4287521490060780,328324625277864008, 27514775912958768464,2505202120094546731584, 246288599061132553970160, 26004541628560046316399382, 2935176211106696031739535696] |