The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 24 |
| 5 | 48 |
| 6 | 384 |
| 7 | 1152 |
| 8 | 2304 |
| 9 | 9216 |
| 10 | 46080 |
| 11 | 414720 |
| 12 | 829440 |
| 13 | 13271040 |
| 14 | 79626240 |
| 15 | 318504960 |
| 16 | 637009920 |
| 17 | 1911029760 |
| 18 | 15288238080 |
| 19 | 107017666560 |
| 20 | 535088332800 |
| 21 | 1070176665600 |
| 22 | 9631589990400 |
| 23 | 38526359961600 |
| 24 | 77052719923200 |
[1,2,8,24,48,384,1152,2304,9216,46080,414720, 829440,13271040,79626240,318504960,637009920, 1911029760,15288238080,107017666560,535088332800, 1070176665600,9631589990400,38526359961600, 77052719923200] |