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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 23 |
| 3 | 178 |
| 4 | 1763 |
| 5 | 21504 |
| 6 | 313585 |
| 7 | 5342068 |
| 8 | 104376201 |
| 9 | 2304582544 |
| 10 | 56807530871 |
| 11 | 1547599725720 |
| 12 | 46202052688603 |
| 13 | 1500629138909632 |
| 14 | 52697989385197137 |
| 15 | 1990117967149595824 |
| 16 | 80440669725095395025 |
| 17 | 3465573101368534916928 |
[1,4,23,178,1763,21504,313585,5342068,104376201, 2304582544,56807530871,1547599725720, 46202052688603,1500629138909632,52697989385197137, 1990117967149595824,80440669725095395025, 3465573101368534916928] |