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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 83 |
| 4 | 976 |
| 5 | 14957 |
| 6 | 283732 |
| 7 | 6433975 |
| 8 | 170054416 |
| 9 | 5139522809 |
| 10 | 174971556244 |
| 11 | 6629428776995 |
| 12 | 276781652752216 |
| 13 | 12628372294445221 |
| 14 | 625247682269320156 |
| 15 | 33391212230179659503 |
| 16 | 1913456535998407683616 |
| 17 | 117119224411257276521585 |
| 18 | 7626303151773884006887972 |
[1,2,10,83,976,14957,283732,6433975,170054416, 5139522809,174971556244,6629428776995, 276781652752216,12628372294445221, 625247682269320156,33391212230179659503, 1913456535998407683616,117119224411257276521585, 7626303151773884006887972] |