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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 187 |
| 3 | 1223 |
| 4 | 9347 |
| 5 | 72573 |
| 6 | 577279 |
| 7 | 4654925 |
| 8 | 37943939 |
| 9 | 311837075 |
| 10 | 2579551497 |
| 11 | 21450968309 |
| 12 | 179155113323 |
| 13 | 1501673922057 |
| 14 | 12625149738521 |
| 15 | 106416815593683 |
| 16 | 898941182378771 |
| 17 | 7607848721495845 |
| 18 | 64489085542582579 |
| 19 | 547401698354394021 |
[1,23,187,1223,9347,72573,577279,4654925,37943939, 311837075,2579551497,21450968309,179155113323, 1501673922057,12625149738521,106416815593683, 898941182378771,7607848721495845, 64489085542582579,547401698354394021] |