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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 60 |
| 3 | 935 |
| 4 | 16555 |
| 5 | 316251 |
| 6 | 6353760 |
| 7 | 132321990 |
| 8 | 2830853610 |
| 9 | 61841702065 |
| 10 | 1373736123760 |
| 11 | 30935736733230 |
| 12 | 704631080073635 |
| 13 | 16204866668942000 |
| 14 | 375762274309378440 |
| 15 | 8775795659568727020 |
| 16 | 206241872189050376550 |
| 17 | 4873761343609509542490 |
[1,5,60,935,16555,316251,6353760,132321990, 2830853610,61841702065,1373736123760, 30935736733230,704631080073635,16204866668942000, 375762274309378440,8775795659568727020, 206241872189050376550,4873761343609509542490] |