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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 76 |
| 10 | 284 |
| 11 | 1948 |
| 12 | 12241 |
| 13 | 60886 |
| 14 | 350497 |
| 15 | 2915669 |
| 16 | 33310308 |
| 17 | 416154595 |
| 18 | 5212602941 |
| 19 | 75431474711 |
| 20 | 1382363604714 |
| 21 | 31384746574285 |
[1,7,19,37,76,284,1948,12241,60886,350497,2915669, 33310308,416154595,5212602941,75431474711, 1382363604714,31384746574285] |