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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 90 |
| 2 | 5040 |
| 3 | 226800 |
| 4 | 9008496 |
| 5 | 330674400 |
| 6 | 11511434880 |
| 7 | 386143718400 |
| 8 | 12611398415616 |
| 9 | 403864019919360 |
| 10 | 12744269679697920 |
| 11 | 397694704355020800 |
| 12 | 12304809943691636736 |
| 13 | 378212825199337758720 |
| 14 | 11565710925825703772160 |
[1,90,5040,226800,9008496,330674400,11511434880, 386143718400,12611398415616,403864019919360, 12744269679697920,397694704355020800, 12304809943691636736,378212825199337758720, 11565710925825703772160] |