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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 4862 |
| 3 | 549120 |
| 4 | 65132550 |
| 5 | 7945986048 |
| 6 | 987291797996 |
| 7 | 124259864002560 |
| 8 | 15789207515217990 |
| 9 | 2021092963752345600 |
| 10 | 260227401685879140612 |
| 11 | 33665720694993527504896 |
| 12 | 4372592850984736084611996 |
| 13 | 569819472537519480058675200 |
| 14 | 74468439316740019538310543000 |
[1,48,4862,549120,65132550,7945986048, 987291797996,124259864002560,15789207515217990, 2021092963752345600,260227401685879140612, 33665720694993527504896,4372592850984736084611996, 569819472537519480058675200, 74468439316740019538310543000] |