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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 14 |
| 4 | 332 |
| 5 | 18264 |
| 6 | 1664354 |
| 7 | 222406776 |
| 8 | 40865005494 |
| 9 | 9880209206458 |
| 10 | 3041127561315224 |
| 11 | 1161157777643184900 |
| 12 | 538583682082245127336 |
| 13 | 298292500833816420226008 |
| 14 | 194444097328912809590995986 |
| 15 | 147362699895662080130636012160 |
| 16 | 128481853971530055408959624233748 |
| 17 | 127695847335468919414701788927638656 |
[2,14,332,18264,1664354,222406776,40865005494, 9880209206458,3041127561315224, 1161157777643184900,538583682082245127336, 298292500833816420226008, 194444097328912809590995986, 147362699895662080130636012160, 128481853971530055408959624233748, 127695847335468919414701788927638656] |