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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 149 |
| 4 | 2357 |
| 5 | 10541 |
| 6 | 57735 |
| 7 | 745356 |
| 8 | 1490712 |
| 9 | 182574186 |
| 10 | 2357022604 |
| 11 | 298142397 |
| 12 | 7453559925 |
| 13 | 1490711985 |
| 14 | 10540925533895 |
| 15 | 74535599249993 |
| 16 | 105409255338946 |
| 17 | 7453559924999299 |
| 18 | 14907119849998598 |
| 19 | 471404520791031683 |
[1,15,149,2357,10541,57735,745356,1490712, 182574186,2357022604,298142397,7453559925, 1490711985,10540925533895,74535599249993, 105409255338946,7453559924999299, 14907119849998598,471404520791031683] |