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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 39 |
| 4 | 596 |
| 5 | 12365 |
| 6 | 324714 |
| 7 | 10329655 |
| 8 | 386190328 |
| 9 | 16597810233 |
| 10 | 806356830230 |
| 11 | 43700423019011 |
| 12 | 2613919719004692 |
| 13 | 171053575111641157 |
| 14 | 12156558707970920866 |
| 15 | 932424974682447304815 |
| 16 | 76772968644326739801584 |
| 17 | 6754080601542663692950769 |
[1,1,4,39,596,12365,324714,10329655,386190328, 16597810233,806356830230,43700423019011, 2613919719004692,171053575111641157, 12156558707970920866,932424974682447304815, 76772968644326739801584,6754080601542663692950769] |