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| n | a(n) |
|---|---|
| 0 | 6 |
| 1 | 840 |
| 2 | 142926 |
| 3 | 27475440 |
| 4 | 5411913654 |
| 5 | 1070576860920 |
| 6 | 211936375592766 |
| 7 | 41961230070745440 |
| 8 | 8308074191463867366 |
| 9 | 1644955457291036718120 |
| 10 | 325692829279638552084654 |
| 11 | 64485533774729467185564240 |
| 12 | 12767809944726167559580210326 |
| 13 | 2527961881828880059792526682840 |
| 14 | 500523684734657069477415103656606 |
[6,840,142926,27475440,5411913654,1070576860920, 211936375592766,41961230070745440, 8308074191463867366,1644955457291036718120, 325692829279638552084654, 64485533774729467185564240, 12767809944726167559580210326, 2527961881828880059792526682840, 500523684734657069477415103656606] |