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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 166 |
| 3 | 1784 |
| 4 | 17840 |
| 5 | 163504 |
| 6 | 1418549 |
| 7 | 11751784 |
| 8 | 94002810 |
| 9 | 730859800 |
| 10 | 5554472496 |
| 11 | 41437244784 |
| 12 | 304478259625 |
| 13 | 2209596042260 |
| 14 | 15871463933950 |
| 15 | 113044318064744 |
| 16 | 799558820643440 |
| 17 | 5622796403700080 |
| 18 | 39354459839661725 |
[1,12,166,1784,17840,163504,1418549,11751784, 94002810,730859800,5554472496,41437244784, 304478259625,2209596042260,15871463933950, 113044318064744,799558820643440,5622796403700080, 39354459839661725] |