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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 288 |
| 5 | 34560 |
| 6 | 24883200 |
| 7 | 125411328000 |
| 8 | 5056584744960000 |
| 9 | 1834933472251084800000 |
| 10 | 6658606584104736522240000000 |
| 11 | 265790267296391946810949632000000000 |
| 12 | 127313963299399416749559771247411200000000000 |
| 13 | 792786697595796795607377086400871488552960000000000000 |
[1,1,2,12,288,34560,24883200,125411328000, 5056584744960000,1834933472251084800000, 6658606584104736522240000000, 265790267296391946810949632000000000, 127313963299399416749559771247411200000000000, 79278669759579679560737708640087148855296000000000\ 0000] |