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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 29 |
| 4 | 308 |
| 5 | 4349 |
| 6 | 77094 |
| 7 | 1650893 |
| 8 | 41532280 |
| 9 | 1201865049 |
| 10 | 39351776970 |
| 11 | 1438731784137 |
| 12 | 58107225611412 |
| 13 | 2569486856423733 |
| 14 | 123475320944016846 |
| 15 | 6407225728624769925 |
| 16 | 357061085760608504304 |
| 17 | 21268522319028809507889 |
| 18 | 1348496822257863921774738 |
[0,1,4,29,308,4349,77094,1650893,41532280, 1201865049,39351776970,1438731784137, 58107225611412,2569486856423733, 123475320944016846,6407225728624769925, 357061085760608504304,21268522319028809507889, 1348496822257863921774738] |