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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 969 |
| 5 | 23471 |
| 6 | 722893 |
| 7 | 27025349 |
| 8 | 1188914961 |
| 9 | 60185489239 |
| 10 | 3446702343621 |
| 11 | 220325043859361 |
| 12 | 15551414491260409 |
| 13 | 1201309497935878085 |
| 14 | 100806806760636877293 |
| 15 | 9131452009580323562311 |
| 16 | 888090470343071154122145 |
[1,1,5,55,969,23471,722893,27025349,1188914961, 60185489239,3446702343621,220325043859361, 15551414491260409,1201309497935878085, 100806806760636877293,9131452009580323562311, 888090470343071154122145] |