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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 90 |
| 4 | 2401 |
| 5 | 101761 |
| 6 | 6291216 |
| 7 | 534649500 |
| 8 | 59805912601 |
| 9 | 8519381695801 |
| 10 | 1505829663622626 |
| 11 | 323403835613234310 |
| 12 | 82950935886564603001 |
| 13 | 25045332571083387933241 |
| 14 | 8792814340394735774002236 |
| 15 | 3551704765357254157594658520 |
| 16 | 1635557840926288462033032891601 |
[1,1,6,90,2401,101761,6291216,534649500, 59805912601,8519381695801,1505829663622626, 323403835613234310,82950935886564603001, 25045332571083387933241,8792814340394735774002236, 3551704765357254157594658520, 1635557840926288462033032891601] |