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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 21952 |
| 4 | 323944 |
| 5 | 6854952 |
| 6 | 178305048 |
| 7 | 4999029536 |
| 8 | 141146699520 |
| 9 | 3989674803520 |
| 10 | 110739317322272 |
| 11 | 3087271127827656 |
| 12 | 86319234833420472 |
| 13 | 2417043704537112896 |
| 14 | 67688853144047810688 |
| 15 | 1895586025861761402304 |
[0,0,21952,323944,6854952,178305048,4999029536, 141146699520,3989674803520,110739317322272, 3087271127827656,86319234833420472, 2417043704537112896,67688853144047810688, 1895586025861761402304] |