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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 21 |
| 4 | 337 |
| 5 | 11985 |
| 6 | 930241 |
| 7 | 155643329 |
| 8 | 55638770689 |
| 9 | 42200814258433 |
| 10 | 67536939792143361 |
| 11 | 227017234854393949185 |
| 12 | 1596674435594864988020737 |
| 13 | 23421099407847007850007154689 |
| 14 | 714530983411175509576743561314305 |
| 15 | 45227689798343820164634911814524846081 |
[1,1,3,21,337,11985,930241,155643329,55638770689, 42200814258433,67536939792143361, 227017234854393949185,1596674435594864988020737, 23421099407847007850007154689, 714530983411175509576743561314305, 45227689798343820164634911814524846081] |