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| n | a(n) |
|---|---|
| 1 | 124 |
| 2 | 960 |
| 3 | 7308 |
| 4 | 55864 |
| 5 | 426596 |
| 6 | 3258496 |
| 7 | 24887884 |
| 8 | 190093096 |
| 9 | 1451920276 |
| 10 | 11089697360 |
| 11 | 84702551132 |
| 12 | 646953877560 |
| 13 | 4941401481188 |
| 14 | 37742178485600 |
| 15 | 288272879761068 |
| 16 | 2201813900709576 |
| 17 | 16817344930171316 |
| 18 | 128450043128179312 |
[124,960,7308,55864,426596,3258496,24887884, 190093096,1451920276,11089697360,84702551132, 646953877560,4941401481188,37742178485600, 288272879761068,2201813900709576, 16817344930171316,128450043128179312] |