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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 17 |
| 3 | 151 |
| 4 | 1327 |
| 5 | 11941 |
| 6 | 107467 |
| 7 | 967201 |
| 8 | 8704783 |
| 9 | 78343019 |
| 10 | 705087151 |
| 11 | 6345784343 |
| 12 | 57112059061 |
| 13 | 514008531493 |
| 14 | 4626076783423 |
| 15 | 41634691050803 |
| 16 | 374712219457181 |
| 17 | 3372409975114627 |
| 18 | 30351689776031621 |
| 19 | 273165207984284509 |
| 20 | 2458486871858560579 |
| 21 | 22126381846727045189 |
| 22 | 199137436620543406691 |
[2,17,151,1327,11941,107467,967201,8704783, 78343019,705087151,6345784343,57112059061, 514008531493,4626076783423,41634691050803, 374712219457181,3372409975114627, 30351689776031621,273165207984284509, 2458486871858560579,22126381846727045189, 199137436620543406691] |