The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 96 |
| 3 | 72 |
| 4 | 46080 |
| 5 | 1152 |
| 6 | 2322432 |
| 7 | 100352 |
| 8 | 7431782400 |
| 9 | 2090188800 |
| 10 | 2452488192000 |
| 11 | 2697737011200 |
| 12 | 64274810535936000 |
| 13 | 2923954176000 |
| 14 | 1799694695006208000 |
| 15 | 3085190905724928 |
| 16 | 33566877054287216640000 |
| 17 | 4458100858772520960000 |
| 18 | 120538655501945394954240000 |
| 19 | 1057781497894797312000 |
[4,96,72,46080,1152,2322432,100352,7431782400, 2090188800,2452488192000,2697737011200, 64274810535936000,2923954176000, 1799694695006208000,3085190905724928, 33566877054287216640000,4458100858772520960000, 120538655501945394954240000, 1057781497894797312000] |