| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 54 |
| 3 | 341 |
| 4 | 1949 |
| 5 | 10906 |
| 6 | 59952 |
| 7 | 311644 |
| 8 | 1513042 |
| 9 | 6877791 |
| 10 | 29429777 |
| 11 | 119153363 |
| 12 | 458571762 |
| 13 | 1684448300 |
| 14 | 5926680882 |
| 15 | 20037283285 |
| 16 | 65276341407 |
| 17 | 205423183265 |
| 18 | 625887083947 |
| 19 | 1850014507021 |
| 20 | 5314738730828 |
| 21 | 14864035315827 |
| 22 | 40531623551553 |
[6,54,341,1949,10906,59952,311644,1513042,6877791, 29429777,119153363,458571762,1684448300, 5926680882,20037283285,65276341407,205423183265, 625887083947,1850014507021,5314738730828, 14864035315827,40531623551553] |