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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 93 |
| 3 | 595 |
| 4 | 3845 |
| 5 | 24983 |
| 6 | 162805 |
| 7 | 1062635 |
| 8 | 6941843 |
| 9 | 45369865 |
| 10 | 296598577 |
| 11 | 1939229883 |
| 12 | 12680054343 |
| 13 | 82914396455 |
| 14 | 542185539797 |
| 15 | 3545445779213 |
| 16 | 23184429833549 |
| 17 | 151608454599649 |
| 18 | 991405196934357 |
| 19 | 6483050068051005 |
[1,15,93,595,3845,24983,162805,1062635,6941843, 45369865,296598577,1939229883,12680054343, 82914396455,542185539797,3545445779213, 23184429833549,151608454599649,991405196934357, 6483050068051005] |