The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 24 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 0 |
| 18 | 96 |
| 19 | 0 |
| 20 | 120 |
| 21 | 6 |
| 22 | 0 |
| 23 | 0 |
| 24 | 720 |
| 25 | 0 |
| 26 | 0 |
| 27 | 0 |
| 28 | 0 |
| 29 | 0 |
| 30 | 720 |
| 31 | 0 |
| 32 | 0 |
| 33 | 0 |
| 34 | 0 |
| 35 | 0 |
| 36 | 322560 |
| 37 | 0 |
| 38 | 0 |
| 39 | 0 |
| 40 | 5040 |
| 41 | 0 |
| 42 | 4320 |
| 43 | 0 |
| 44 | 0 |
| 45 | 0 |
| 46 | 0 |
| 47 | 0 |
| 48 | 362880 |
| 49 | 0 |
| 50 | 0 |
[0,0,0,0,0,2,0,0,0,0,0,24,0,0,0,0,0,96,0,120,6,0, 0,720,0,0,0,0,0,720,0,0,0,0,0,322560,0,0,0,5040,0, 4320,0,0,0,0,0,362880,0,0] |