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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 195408 |
| 3 | 16785216 |
| 4 | 397963344 |
| 5 | 4629612960 |
| 6 | 34417365696 |
| 7 | 187489131648 |
| 8 | 814883829840 |
| 9 | 2975546033136 |
| 10 | 9486545735520 |
| 11 | 27052971581376 |
| 12 | 70486219194048 |
| 13 | 169931067595296 |
| 14 | 384163605641088 |
[1,48,195408,16785216,397963344,4629612960, 34417365696,187489131648,814883829840, 2975546033136,9486545735520,27052971581376, 70486219194048,169931067595296,384163605641088] |