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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 143 |
| 3 | 1704 |
| 4 | 20305 |
| 5 | 241956 |
| 6 | 2883167 |
| 7 | 34356048 |
| 8 | 409389409 |
| 9 | 4878316860 |
| 10 | 58130412911 |
| 11 | 692686638072 |
| 12 | 8254109243953 |
| 13 | 98356624289364 |
| 14 | 1172025382228415 |
| 15 | 13965947962451616 |
| 16 | 166419350167190977 |
| 17 | 1983066254043840108 |
| 18 | 23630375698358890319 |
| 19 | 281581442126262843720 |
[1,12,143,1704,20305,241956,2883167,34356048, 409389409,4878316860,58130412911,692686638072, 8254109243953,98356624289364,1172025382228415, 13965947962451616,166419350167190977, 1983066254043840108,23630375698358890319, 281581442126262843720] |