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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 131 |
| 4 | 1821 |
| 5 | 29121 |
| 6 | 526631 |
| 7 | 10619735 |
| 8 | 236128585 |
| 9 | 5736575845 |
| 10 | 151132416435 |
| 11 | 4290611159835 |
| 12 | 130556978677125 |
| 13 | 4238232623249625 |
| 14 | 146189527883974575 |
| 15 | 5338862100892695375 |
| 16 | 205783734992407196625 |
| 17 | 8347924728847446868125 |
| 18 | 355508623895766152686875 |
[1,1,11,131,1821,29121,526631,10619735,236128585, 5736575845,151132416435,4290611159835, 130556978677125,4238232623249625, 146189527883974575,5338862100892695375, 205783734992407196625,8347924728847446868125, 355508623895766152686875] |