| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 6006 |
| 3 | 860160 |
| 4 | 130378950 |
| 5 | 20392706048 |
| 6 | 3254013513660 |
| 7 | 526470648692736 |
| 8 | 86047769258554950 |
| 9 | 14173603389190963200 |
| 10 | 2349023203055914140756 |
| 11 | 391249767795614684282880 |
| 12 | 65434374898388743460014620 |
| 13 | 10981406991821583404677201920 |
[1,48,6006,860160,130378950,20392706048, 3254013513660,526470648692736,86047769258554950, 14173603389190963200,2349023203055914140756, 391249767795614684282880, 65434374898388743460014620, 10981406991821583404677201920] |