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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 17 |
| 3 | 249 |
| 4 | 4345 |
| 5 | 83285 |
| 6 | 1694273 |
| 7 | 35915349 |
| 8 | 784691569 |
| 9 | 17545398747 |
| 10 | 399545961817 |
| 11 | 9234298584921 |
| 12 | 216053290499201 |
| 13 | 5107287712887563 |
| 14 | 121795876378121121 |
| 15 | 2926604574330886897 |
| 16 | 70788399943851406825 |
| 17 | 1722188546498276868124 |
| 18 | 42114624858397590035177 |
[1,2,17,249,4345,83285,1694273,35915349,784691569, 17545398747,399545961817,9234298584921, 216053290499201,5107287712887563, 121795876378121121,2926604574330886897, 70788399943851406825,1722188546498276868124, 42114624858397590035177] |