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| n | a(n) |
|---|---|
| 9 | 1 |
| 10 | 405 |
| 11 | 37125 |
| 12 | 1738935 |
| 13 | 64914993 |
| 14 | 1775214441 |
| 15 | 38186115825 |
| 16 | 751359827790 |
| 17 | 13076544824343 |
| 18 | 207877406991111 |
| 19 | 3041686131983343 |
| 20 | 41512373437449915 |
| 21 | 544051964769008601 |
| 22 | 6850772610392201733 |
| 23 | 82608610920666732693 |
| 24 | 956263706215482795570 |
| 25 | 10851693841665124551180 |
[1,405,37125,1738935,64914993,1775214441, 38186115825,751359827790,13076544824343, 207877406991111,3041686131983343, 41512373437449915,544051964769008601, 6850772610392201733,82608610920666732693, 956263706215482795570,10851693841665124551180] |