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| n | a(n) |
|---|---|
| 1 | 537 |
| 2 | 2111 |
| 3 | 7900 |
| 4 | 40199 |
| 5 | 189527 |
| 6 | 1031110 |
| 7 | 5389465 |
| 8 | 30143115 |
| 9 | 165929972 |
| 10 | 944003155 |
| 11 | 5344612635 |
| 12 | 30772376030 |
| 13 | 177071735521 |
| 14 | 1028182698707 |
| 15 | 5974708787086 |
| 16 | 34897441921851 |
| 17 | 204032291698675 |
| 18 | 1196536094450238 |
| 19 | 7023128154032847 |
[537,2111,7900,40199,189527,1031110,5389465, 30143115,165929972,944003155,5344612635, 30772376030,177071735521,1028182698707, 5974708787086,34897441921851,204032291698675, 1196536094450238,7023128154032847] |