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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 53 |
| 5 | 361 |
| 6 | 3707 |
| 7 | 60299 |
| 8 | 1611917 |
| 9 | 72878969 |
| 10 | 5702474099 |
| 11 | 786309124267 |
| 12 | 193799682039045 |
| 13 | 86339557133251369 |
| 14 | 70158421732175677771 |
| 15 | 104756929383173098118827 |
| 16 | 289215969367883566518863261 |
[1,3,11,53,361,3707,60299,1611917,72878969, 5702474099,786309124267,193799682039045, 86339557133251369,70158421732175677771, 104756929383173098118827, 289215969367883566518863261] |