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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 72 |
| 3 | 3414 |
| 4 | 293944 |
| 5 | 41039354 |
| 6 | 8367429708 |
| 7 | 2357010259478 |
| 8 | 874618137470928 |
| 9 | 414021560815549234 |
| 10 | 243310775798418308468 |
| 11 | 173871629687917706426926 |
| 12 | 148440940042136025757065080 |
[1,4,72,3414,293944,41039354,8367429708, 2357010259478,874618137470928,414021560815549234, 243310775798418308468,173871629687917706426926, 148440940042136025757065080] |