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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 362870 |
| 11 | 362770 |
| 12 | 361560 |
| 13 | 345720 |
| 14 | 122640 |
| 15 | -3240720 |
| 16 | -57294720 |
| 17 | -979816320 |
| 18 | -17642862720 |
| 19 | -17642862701 |
| 20 | -17642862340 |
| 21 | -17642854740 |
| 22 | -17642687160 |
| 23 | -17638824840 |
| 24 | -17545953600 |
| 25 | -15220134720 |
| 26 | 45348065280 |
| 27 | 1683112193280 |
[1,2,6,24,120,720,5040,40320,362880,362870,362770, 361560,345720,122640,-3240720,-57294720, -979816320,-17642862720,-17642862701,-17642862340, -17642854740,-17642687160,-17638824840, -17545953600,-15220134720,45348065280, 1683112193280] |