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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 64 |
| 4 | 720 |
| 5 | 9136 |
| 6 | 122016 |
| 7 | 1673344 |
| 8 | 23216640 |
| 9 | 323773696 |
| 10 | 4525272576 |
| 11 | 63308468224 |
| 12 | 886046453760 |
| 13 | 12403017773056 |
| 14 | 173632453287936 |
| 15 | 2430795572936704 |
| 16 | 34030785382318080 |
| 17 | 476428879520137216 |
| 18 | 6669991618287108096 |
| 19 | 93379806486052470784 |
| 20 | 1307316833784928665600 |
[0,1,6,64,720,9136,122016,1673344,23216640, 323773696,4525272576,63308468224,886046453760, 12403017773056,173632453287936,2430795572936704, 34030785382318080,476428879520137216, 6669991618287108096,93379806486052470784, 1307316833784928665600] |