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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 246 |
| 4 | 2379 |
| 5 | 23628 |
| 6 | 239058 |
| 7 | 2450052 |
| 8 | 25351755 |
| 9 | 264270765 |
| 10 | 2771024652 |
| 11 | 29194911342 |
| 12 | 308813298690 |
| 13 | 3277454178144 |
| 14 | 34883317836240 |
| 15 | 372195546176496 |
| 16 | 3979793738688075 |
| 17 | 42635773396647054 |
| 18 | 457529396858568837 |
| 19 | 4917191231017846902 |
| 20 | 52917857164300253004 |
[1,3,27,246,2379,23628,239058,2450052,25351755, 264270765,2771024652,29194911342,308813298690, 3277454178144,34883317836240,372195546176496, 3979793738688075,42635773396647054, 457529396858568837,4917191231017846902, 52917857164300253004] |