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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 70 |
| 3 | 2180 |
| 4 | 95729 |
| 5 | 5422192 |
| 6 | 375951144 |
| 7 | 30833206304 |
| 8 | 2919367902648 |
| 9 | 313380517364324 |
| 10 | 37606931999739230 |
| 11 | 4988933437333555060 |
| 12 | 724960700435104219679 |
| 13 | 114519163835687116024256 |
| 14 | 19538926882901715534673728 |
| 15 | 3580844611314789257667535968 |
| 16 | 701546780854024941112271649610 |
| 17 | 146318317830136401429653726419700 |
| 18 | 32367591848747955557013839920695374 |
| 19 | 7569528177000020896435962191564396740 |
[1,4,70,2180,95729,5422192,375951144,30833206304, 2919367902648,313380517364324,37606931999739230, 4988933437333555060,724960700435104219679, 114519163835687116024256, 19538926882901715534673728, 3580844611314789257667535968, 701546780854024941112271649610, 146318317830136401429653726419700, 32367591848747955557013839920695374, 7569528177000020896435962191564396740] |