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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 276 |
| 4 | 1161678 |
| 5 | 620383261034 |
| 6 | 80434777704834144228 |
| 7 | 3212151962391797592956111856142 |
| 8 | 58141033434729590882944205957642581926272684 |
| 9 | 738506234630963222745737660670442498620046849638365979249010 |
[1,1,4,276,1161678,620383261034, 80434777704834144228, 3212151962391797592956111856142, 58141033434729590882944205957642581926272684, 73850623463096322274573766067044249862004684963836\ 5979249010] |