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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 104 |
| 3 | 6544 |
| 4 | 765344 |
| 5 | 143639104 |
| 6 | 39511297664 |
| 7 | 14979797833984 |
| 8 | 7487442077817344 |
| 9 | 4770988535512474624 |
| 10 | 3774873839360539879424 |
| 11 | 3630982576832133263233024 |
| 12 | 4172729918808369709126098944 |
[1,4,104,6544,765344,143639104,39511297664, 14979797833984,7487442077817344, 4770988535512474624,3774873839360539879424, 3630982576832133263233024, 4172729918808369709126098944] |