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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 63 |
| 5 | 1575 |
| 6 | 68409 |
| 7 | 4729725 |
| 8 | 488783295 |
| 9 | 71982456975 |
| 10 | 14550187083705 |
| 11 | 3916321542458325 |
| 12 | 1368981608178405375 |
| 13 | 608576219802039864375 |
| 14 | 337967570725260384533625 |
| 15 | 230885276313275432674678125 |
| 16 | 191452972504088518574149173375 |
| 17 | 190442238700388913304502070009375 |
[1,1,5,63,1575,68409,4729725,488783295, 71982456975,14550187083705,3916321542458325, 1368981608178405375,608576219802039864375, 337967570725260384533625, 230885276313275432674678125, 191452972504088518574149173375, 190442238700388913304502070009375] |