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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 272 |
| 3 | 291 |
| 4 | 4262 |
| 5 | 17391 |
| 6 | 123297 |
| 7 | 793698 |
| 8 | 5028590 |
| 9 | 34392736 |
| 10 | 221789997 |
| 11 | 1497953765 |
| 12 | 9866999355 |
| 13 | 65897227621 |
| 14 | 437859946970 |
| 15 | 2915079779300 |
| 16 | 19405102950022 |
| 17 | 129161733879823 |
| 18 | 859965941267175 |
| 19 | 5724809453205005 |
[1,272,291,4262,17391,123297,793698,5028590, 34392736,221789997,1497953765,9866999355, 65897227621,437859946970,2915079779300, 19405102950022,129161733879823,859965941267175, 5724809453205005] |