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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 361 |
| 3 | 3391 |
| 4 | 37237 |
| 5 | 416111 |
| 6 | 4761901 |
| 7 | 55250583 |
| 8 | 648017421 |
| 9 | 7662743017 |
| 10 | 91199048321 |
| 11 | 1091067528549 |
| 12 | 13108510159921 |
| 13 | 158042063686499 |
| 14 | 1910968040115173 |
| 15 | 23162642662833881 |
| 16 | 281323809804798781 |
[1,31,361,3391,37237,416111,4761901,55250583, 648017421,7662743017,91199048321,1091067528549, 13108510159921,158042063686499,1910968040115173, 23162642662833881,281323809804798781] |