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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 60 |
| 4 | 906 |
| 5 | 27189 |
| 6 | 1613401 |
| 7 | 189475577 |
| 8 | 44047431458 |
| 9 | 20270048678813 |
| 10 | 18464881592730174 |
| 11 | 33296006308979741676 |
| 12 | 118848050819226253876856 |
| 13 | 839743872159535017880129008 |
| 14 | 11745095000736439254980601740977 |
| 15 | 325177925025179018978272596740130128 |
[1,2,8,60,906,27189,1613401,189475577,44047431458, 20270048678813,18464881592730174, 33296006308979741676,118848050819226253876856, 839743872159535017880129008, 11745095000736439254980601740977, 325177925025179018978272596740130128] |