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| n | a(n) |
|---|---|
| 1 | 32 |
| 2 | 120 |
| 3 | 448 |
| 4 | 1680 |
| 5 | 6272 |
| 6 | 23520 |
| 7 | 87808 |
| 8 | 329280 |
| 9 | 1229312 |
| 10 | 4609920 |
| 11 | 17210368 |
| 12 | 64538880 |
| 13 | 240945152 |
| 14 | 903544320 |
| 15 | 3373232128 |
| 16 | 12649620480 |
| 17 | 47225249792 |
| 18 | 177094686720 |
| 19 | 661153497088 |
| 20 | 2479325614080 |
| 21 | 9256148959232 |
| 22 | 34710558597120 |
[32,120,448,1680,6272,23520,87808,329280,1229312, 4609920,17210368,64538880,240945152,903544320, 3373232128,12649620480,47225249792,177094686720, 661153497088,2479325614080,9256148959232, 34710558597120] |