The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 12 |
| 7 | 72 |
| 8 | 480 |
| 9 | 3600 |
| 10 | 30240 |
| 11 | 282240 |
| 12 | 2903040 |
| 13 | 32659200 |
| 14 | 399168000 |
| 15 | 5269017600 |
| 16 | 74724249600 |
| 17 | 1133317785600 |
| 18 | 18307441152000 |
| 19 | 313841848320000 |
| 20 | 5690998849536000 |
| 21 | 108840352997376000 |
| 22 | 2189611807358976000 |
| 23 | 46225138155356160000 |
| 24 | 1021818843434188800000 |
[0,1,2,12,72,480,3600,30240,282240,2903040, 32659200,399168000,5269017600,74724249600, 1133317785600,18307441152000,313841848320000, 5690998849536000,108840352997376000, 2189611807358976000,46225138155356160000, 1021818843434188800000] |