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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 341 |
| 3 | 6483 |
| 4 | 69905 |
| 5 | 2027247 |
| 6 | 21041413 |
| 7 | 417263459 |
| 8 | 4311810305 |
| 9 | 133666119455 |
| 10 | 1461703693397 |
| 11 | 27806864656979 |
| 12 | 299071474565137 |
| 13 | 8708265758097903 |
| 14 | 90161415181374469 |
| 15 | 1785159701350222947 |
| 16 | 18447025552981295105 |
[1,31,341,6483,69905,2027247,21041413,417263459, 4311810305,133666119455,1461703693397, 27806864656979,299071474565137,8708265758097903, 90161415181374469,1785159701350222947, 18447025552981295105] |