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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 43 |
| 4 | 312 |
| 5 | 3121 |
| 6 | 39616 |
| 7 | 602135 |
| 8 | 10547538 |
| 9 | 207620746 |
| 10 | 4514623895 |
| 11 | 107150379369 |
| 12 | 2751648614456 |
| 13 | 75953000041971 |
| 14 | 2241736112814551 |
| 15 | 70446370941793711 |
| 16 | 2348550874184397643 |
| 17 | 82802885494751780415 |
[1,3,9,43,312,3121,39616,602135,10547538, 207620746,4514623895,107150379369,2751648614456, 75953000041971,2241736112814551,70446370941793711, 2348550874184397643,82802885494751780415] |