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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 259 |
| 5 | 750371 |
| 6 | 81566917 |
| 7 | 2642791002353 |
| 8 | 716984262871579 |
| 9 | 102688143363690674087 |
| 10 | 21841112114495269555043222069 |
| 11 | 17727866746681961093761724283871 |
[1,2,13,259,750371,81566917,2642791002353, 716984262871579,102688143363690674087, 21841112114495269555043222069, 17727866746681961093761724283871] |