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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 72 |
| 3 | 2307 |
| 4 | 86295 |
| 5 | 3513477 |
| 6 | 151235361 |
| 7 | 6768437853 |
| 8 | 311788291023 |
| 9 | 14685531568689 |
| 10 | 704028657330720 |
| 11 | 34239755370728001 |
| 12 | 1685178804762196176 |
| 13 | 83776625650642935108 |
| 14 | 4200738946110487797030 |
| 15 | 212201486734654901466543 |
| 16 | 10789009182188638106874636 |
| 17 | 551682346017956870539952958 |
[1,3,72,2307,86295,3513477,151235361,6768437853, 311788291023,14685531568689,704028657330720, 34239755370728001,1685178804762196176, 83776625650642935108,4200738946110487797030, 212201486734654901466543, 10789009182188638106874636, 551682346017956870539952958] |