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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 406 |
| 5 | 7764 |
| 6 | 222936 |
| 7 | 18314708 |
| 8 | 1182352612 |
| 9 | 30892003921 |
| 10 | 3065366376540 |
| 11 | 2070868688611599 |
| 12 | 493143363040812884 |
| 13 | 25923218026065797712 |
| 14 | 11188107558636007931696 |
| 15 | 60230981411511158858617306 |
| 16 | 63827420909748305015725846472 |
| 17 | 9319830273030294425399538816052 |
[1,4,27,406,7764,222936,18314708,1182352612, 30892003921,3065366376540,2070868688611599, 493143363040812884,25923218026065797712, 11188107558636007931696, 60230981411511158858617306, 63827420909748305015725846472, 9319830273030294425399538816052] |