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| n | a(n) |
|---|---|
| 0 | 448448 |
| 1 | 4643520 |
| 2 | 18905280 |
| 3 | 56615360 |
| 4 | 142418880 |
| 5 | 318416448 |
| 6 | 652527680 |
| 7 | 1249469760 |
| 8 | 2264834880 |
| 9 | 3922790720 |
| 10 | 6537968448 |
| 11 | 10542143040 |
| 12 | 16516351040 |
| 13 | 25229131200 |
| 14 | 37681613760 |
| 15 | 55160224448 |
| 16 | 79297809600 |
| 17 | 112144029120 |
| 18 | 156245904320 |
| 19 | 214739448000 |
| 20 | 291453344448 |
| 21 | 391025687360 |
[448448,4643520,18905280,56615360,142418880, 318416448,652527680,1249469760,2264834880, 3922790720,6537968448,10542143040,16516351040, 25229131200,37681613760,55160224448,79297809600, 112144029120,156245904320,214739448000, 291453344448,391025687360] |