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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 3 |
| 3 | 6 |
| 4 | 27 |
| 5 | 162 |
| 6 | 1206 |
| 7 | 10476 |
| 8 | 103059 |
| 9 | 1125738 |
| 10 | 13473378 |
| 11 | 174997908 |
| 12 | 2448791838 |
| 13 | 36706645908 |
| 14 | 586646510796 |
| 15 | 9957100024152 |
| 16 | 178868488496643 |
| 17 | 3390603439026618 |
| 18 | 67639341903290730 |
| 19 | 1416612563019545220 |
| 20 | 31079692422132040170 |
| 21 | 712855563504590236860 |
| 22 | 17061654943814209044660 |
[1,3,3,6,27,162,1206,10476,103059,1125738, 13473378,174997908,2448791838,36706645908, 586646510796,9957100024152,178868488496643, 3390603439026618,67639341903290730, 1416612563019545220,31079692422132040170, 712855563504590236860,17061654943814209044660] |