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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 18 |
| 3 | 322 |
| 4 | 12979 |
| 5 | 924628 |
| 6 | 103158338 |
| 7 | 16710522378 |
| 8 | 3724631345923 |
| 9 | 1097090407192683 |
| 10 | 413803244841678483 |
| 11 | 194887616017161359389 |
| 12 | 112265654949194591311618 |
| 13 | 77751843768367000711311005 |
[1,3,18,322,12979,924628,103158338,16710522378, 3724631345923,1097090407192683,413803244841678483, 194887616017161359389,112265654949194591311618, 77751843768367000711311005] |