| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 1 |
| 7 | 1 |
| 8 | 4 |
| 9 | 5 |
| 10 | 2 |
| 11 | 1 |
| 12 | 12 |
| 13 | 49 |
| 14 | 78 |
| 15 | 40 |
| 16 | 1 |
| 17 | 180 |
| 18 | 11085 |
| 19 | 270610 |
| 20 | 2094264 |
| 21 | 1834560 |
| 22 | 1 |
| 23 | 4210700 |
| 24 | 4952544856489 |
| 25 | 1094968722994345590 |
| 26 | 11723079808649412379800 |
| 27 | 2086231309557403469400000 |
| 28 | 2074509324712524510720000 |
[1,1,1,1,2,1,1,4,5,2,1,12,49,78,40,1,180,11085, 270610,2094264,1834560,1,4210700,4952544856489, 1094968722994345590,11723079808649412379800, 2086231309557403469400000, 2074509324712524510720000] |