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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 7 |
| 5 | 381 |
| 6 | 21748 |
| 7 | 1781154 |
| 8 | 249849880 |
| 9 | 66257728763 |
| 10 | 34495508486976 |
| 11 | 35641629989151608 |
| 12 | 73354595357480683904 |
| 13 | 301272202621204113362497 |
| 14 | 2471648811029413368450098688 |
| 15 | 40527680937730440155535277704046 |
| 16 | 1328578958335783199341353852258282496 |
[0,0,0,7,381,21748,1781154,249849880,66257728763, 34495508486976,35641629989151608, 73354595357480683904,301272202621204113362497, 2471648811029413368450098688, 40527680937730440155535277704046, 1328578958335783199341353852258282496] |