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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3024 |
| 3 | 258048 |
| 4 | 6317136 |
| 5 | 71221248 |
| 6 | 546017472 |
| 7 | 2884460544 |
| 8 | 12928522320 |
| 9 | 45777715200 |
| 10 | 150505102944 |
| 11 | 416199168000 |
| 12 | 1118291799744 |
| 13 | 2614324543488 |
| 14 | 6094814495616 |
| 15 | 12617948012544 |
| 16 | 26477575321680 |
[1,0,3024,258048,6317136,71221248,546017472, 2884460544,12928522320,45777715200,150505102944, 416199168000,1118291799744,2614324543488, 6094814495616,12617948012544,26477575321680] |