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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 45 |
| 4 | 595 |
| 5 | 10475 |
| 6 | 231255 |
| 7 | 6148495 |
| 8 | 191276600 |
| 9 | 6815243040 |
| 10 | 273601200136 |
| 11 | 12217471594856 |
| 12 | 600580173151560 |
| 13 | 32224787998758280 |
| 14 | 1873909224391774760 |
| 15 | 117388347849375956328 |
| 16 | 7880739469498103077588 |
| 17 | 564440024187816634143380 |
[1,1,5,45,595,10475,231255,6148495,191276600, 6815243040,273601200136,12217471594856, 600580173151560,32224787998758280, 1873909224391774760,117388347849375956328, 7880739469498103077588,564440024187816634143380] |