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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 61 |
| 4 | 945 |
| 5 | 18401 |
| 6 | 448033 |
| 7 | 13162689 |
| 8 | 452456833 |
| 9 | 17814732769 |
| 10 | 790829204481 |
| 11 | 39087256226129 |
| 12 | 2129136397634689 |
| 13 | 126740704552712433 |
| 14 | 8186173905423123457 |
| 15 | 570241787130949813441 |
| 16 | 42616054790603864116737 |
[1,1,5,61,945,18401,448033,13162689,452456833, 17814732769,790829204481,39087256226129, 2129136397634689,126740704552712433, 8186173905423123457,570241787130949813441, 42616054790603864116737] |