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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 288 |
| 5 | 5664 |
| 6 | 50688 |
| 7 | 314496 |
| 8 | 1569792 |
| 9 | 6773760 |
| 10 | 26320896 |
| 11 | 94482432 |
| 12 | 318726144 |
| 13 | 1022681088 |
| 14 | 3148873728 |
| 15 | 9366110208 |
| 16 | 27051687936 |
| 17 | 76178522112 |
| 18 | 209845223424 |
| 19 | 566967140352 |
| 20 | 1505815953408 |
| 21 | 3938646491136 |
| 22 | 10161657741312 |
| 23 | 25894399770624 |
| 24 | 65248539181056 |
[0,0,0,288,5664,50688,314496,1569792,6773760, 26320896,94482432,318726144,1022681088,3148873728, 9366110208,27051687936,76178522112,209845223424, 566967140352,1505815953408,3938646491136, 10161657741312,25894399770624,65248539181056] |