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| n | a(n) |
|---|---|
| 1 | 56 |
| 2 | 139 |
| 3 | 1615 |
| 4 | 6783 |
| 5 | 20717 |
| 6 | 451318 |
| 7 | 1543713 |
| 8 | 8288114 |
| 9 | 79113707 |
| 10 | 276340333 |
| 11 | 1878731208 |
| 12 | 14642190232 |
| 13 | 59010752583 |
| 14 | 404841299508 |
| 15 | 2875913561864 |
| 16 | 13757588225177 |
| 17 | 90753330244908 |
| 18 | 606550462257317 |
| 19 | 3111205949073436 |
[56,139,1615,6783,20717,451318,1543713,8288114, 79113707,276340333,1878731208,14642190232, 59010752583,404841299508,2875913561864, 13757588225177,90753330244908,606550462257317, 3111205949073436] |