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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 17 |
| 3 | 337 |
| 4 | 26081 |
| 5 | 1744865 |
| 6 | 309508209 |
| 7 | 45520971441 |
| 8 | 14262333206209 |
| 9 | 3762227031539905 |
| 10 | 1815125042343268305 |
| 11 | 760652468272079182097 |
| 12 | 519897554030667139338913 |
| 13 | 319124893510287714867264161 |
[1,1,17,337,26081,1744865,309508209,45520971441, 14262333206209,3762227031539905, 1815125042343268305,760652468272079182097, 519897554030667139338913, 319124893510287714867264161] |