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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 36 |
| 3 | 972 |
| 4 | 82692 |
| 5 | 22668224 |
| 6 | 20480767016 |
| 7 | 62399482333360 |
| 8 | 654732295896172624 |
| 9 | 24092174555680443592896 |
| 10 | 3156168229958886081384337440 |
| 11 | 1490220874303979634022445823087616 |
[1,4,36,972,82692,22668224,20480767016, 62399482333360,654732295896172624, 24092174555680443592896, 3156168229958886081384337440, 1490220874303979634022445823087616] |