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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 43 |
| 4 | 549 |
| 5 | 9341 |
| 6 | 199303 |
| 7 | 5122503 |
| 8 | 154174121 |
| 9 | 5321093689 |
| 10 | 207228932811 |
| 11 | 8991136486619 |
| 12 | 430126003707997 |
| 13 | 22494400020052533 |
| 14 | 1276807091011902479 |
| 15 | 78178242047074260751 |
| 16 | 5136433584083525179857 |
| 17 | 360458257425576984629873 |
[1,1,5,43,549,9341,199303,5122503,154174121, 5321093689,207228932811,8991136486619, 430126003707997,22494400020052533, 1276807091011902479,78178242047074260751, 5136433584083525179857,360458257425576984629873] |