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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 139 |
| 4 | 1531 |
| 5 | 19021 |
| 6 | 271453 |
| 7 | 4358179 |
| 8 | 76896931 |
| 9 | 1471496341 |
| 10 | 30333401893 |
| 11 | 670125430219 |
| 12 | 15784342627531 |
| 13 | 394467249489661 |
| 14 | 10415430504486733 |
| 15 | 289527454704656659 |
| 16 | 8447556960083354131 |
| 17 | 258008113711846390981 |
| 18 | 8228947382557338981973 |
| 19 | 273472796359924298018299 |
[1,1,13,139,1531,19021,271453,4358179,76896931, 1471496341,30333401893,670125430219, 15784342627531,394467249489661,10415430504486733, 289527454704656659,8447556960083354131, 258008113711846390981,8228947382557338981973, 273472796359924298018299] |