The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 24 |
| 4 | 96 |
| 5 | 960 |
| 6 | 5760 |
| 7 | 80640 |
| 8 | 645120 |
| 9 | 11612160 |
| 10 | 116121600 |
| 11 | 2554675200 |
| 12 | 30656102400 |
| 13 | 797058662400 |
| 14 | 11158821273600 |
| 15 | 334764638208000 |
| 16 | 5356234211328000 |
| 17 | 182111963185152000 |
| 18 | 3278015337332736000 |
| 19 | 124564582818643968000 |
| 20 | 2491291656372879360000 |
| 21 | 104634249567660933120000 |
| 22 | 2301953490488540528640000 |
[1,2,4,24,96,960,5760,80640,645120,11612160, 116121600,2554675200,30656102400,797058662400, 11158821273600,334764638208000,5356234211328000, 182111963185152000,3278015337332736000, 124564582818643968000,2491291656372879360000, 104634249567660933120000, 2301953490488540528640000] |