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| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 14849 |
| 3 | 163020 |
| 4 | 1062500 |
| 5 | 4975322 |
| 6 | 18514405 |
| 7 | 58154912 |
| 8 | 160338680 |
| 9 | 398601390 |
| 10 | 910893148 |
| 11 | 1941103528 |
| 12 | 3899741885 |
| 13 | 7449762880 |
| 14 | 13624665670 |
| 15 | 23987233104 |
| 16 | 40838614531 |
| 17 | 67488892468 |
| 18 | 108601809395 |
| 19 | 170627966340 |
| 20 | 262342539690 |
[512,14849,163020,1062500,4975322,18514405, 58154912,160338680,398601390,910893148,1941103528, 3899741885,7449762880,13624665670,23987233104, 40838614531,67488892468,108601809395,170627966340, 262342539690] |