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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 120 |
| 3 | 528 |
| 4 | 139128 |
| 5 | 609960 |
| 6 | 160554240 |
| 7 | 703893960 |
| 8 | 185279454480 |
| 9 | 812293020528 |
| 10 | 213812329916328 |
| 11 | 937385441796000 |
| 12 | 246739243443988680 |
| 13 | 1081741987539564120 |
| 14 | 284736873122033021040 |
| 15 | 1248329316235215199128 |
| 16 | 328586104843582662292128 |
| 17 | 1440570949193450800230240 |
| 18 | 379188080252621270252095320 |
[0,120,528,139128,609960,160554240,703893960, 185279454480,812293020528,213812329916328, 937385441796000,246739243443988680, 1081741987539564120,284736873122033021040, 1248329316235215199128,328586104843582662292128, 1440570949193450800230240, 379188080252621270252095320] |