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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 144 |
| 3 | 889 |
| 4 | 7675 |
| 5 | 63866 |
| 6 | 502864 |
| 7 | 4108471 |
| 8 | 33311703 |
| 9 | 269021206 |
| 10 | 2180747052 |
| 11 | 17657728229 |
| 12 | 142945674729 |
| 13 | 1157610400394 |
| 14 | 9373284938378 |
| 15 | 75896278735065 |
| 16 | 614558095591053 |
| 17 | 4976204942982610 |
| 18 | 40293442480994080 |
| 19 | 326265843009762463 |
[12,144,889,7675,63866,502864,4108471,33311703, 269021206,2180747052,17657728229,142945674729, 1157610400394,9373284938378,75896278735065, 614558095591053,4976204942982610, 40293442480994080,326265843009762463] |