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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 120 |
| 4 | 32 |
| 5 | 3628800 |
| 6 | 95040 |
| 7 | 87178291200 |
| 8 | 80 |
| 9 | 6402373705728000 |
| 10 | 1216451004088320000 |
| 11 | 1124000727777607680000 |
| 12 | 310224200866619719680000 |
| 13 | 403291461126605635584000000 |
| 14 | 152444172305856930250752000000 |
| 15 | 265252859812191058636308480000000 |
| 16 | 192 |
| 17 | 295232799039604140847618609643520000000 |
[2,12,120,32,3628800,95040,87178291200,80, 6402373705728000,1216451004088320000, 1124000727777607680000,310224200866619719680000, 403291461126605635584000000, 152444172305856930250752000000, 265252859812191058636308480000000,192, 295232799039604140847618609643520000000] |