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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6528 |
| 4 | 669222 |
| 5 | 23794560 |
| 6 | 439895808 |
| 7 | 5182455168 |
| 8 | 43880737824 |
| 9 | 288930474624 |
| 10 | 1559447873280 |
| 11 | 7163528367744 |
| 12 | 28827315287526 |
| 13 | 103769713225728 |
| 14 | 339536635723008 |
| 15 | 1024167365758080 |
| 16 | 2876670341074278 |
[1,0,0,6528,669222,23794560,439895808,5182455168, 43880737824,288930474624,1559447873280, 7163528367744,28827315287526,103769713225728, 339536635723008,1024167365758080,2876670341074278] |