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| n | a(n) |
|---|---|
| 10 | 1 |
| 11 | 11 |
| 12 | 132 |
| 13 | 1430 |
| 14 | 15015 |
| 15 | 156156 |
| 16 | 1625624 |
| 17 | 17055896 |
| 18 | 181158120 |
| 19 | 1953517566 |
| 20 | 21426984722 |
| 21 | 239340203466 |
| 22 | 2724654560628 |
| 23 | 31626047962432 |
| 24 | 374383760685660 |
| 25 | 4520229252281160 |
| 26 | 55662052670665870 |
| 27 | 698975472340315170 |
| 28 | 8949358054013356980 |
| 29 | 116803043793523277190 |
[1,11,132,1430,15015,156156,1625624,17055896, 181158120,1953517566,21426984722,239340203466, 2724654560628,31626047962432,374383760685660, 4520229252281160,55662052670665870, 698975472340315170,8949358054013356980, 116803043793523277190] |